OXFORDI.P.S.

OXFORD INTERNATIONAL PUBLIC SCHOOL (An English Medium Co-Educational Sr. Secondary School. Affiliated to CBSE Delhi) Affl.No. 1730347

[Summer Holiday Homework based on Learning, Listening, Speaking, Projects, Activities, Creativity and Innovative Skills]Class– Twelfth (Summer Holiday Homework 2021-22)

The wonders of where we areAnd where we’ll be

What we doAnd what we see.

What we find and what we seek,Not everyone knows

And I just wonder— mom and dadCould you spend some time with me!!!

Dear Parent,

The world is fighting COVID 19 together. Humanity will surely overcome the pandemic. We pray that allof us emerge out of the current situation strongly. A positive spirit will make life easier. The package here is filledwith many different engaging and fun filled activities to ensure continued progress of your child. Have a great timewith your daughter doing team. HAPPY LEARNING!

Summer vacation is being started w.e.f. May 16, 2021. We have successfully conducted online classes andUnit Test (Practice) also. The school will reopen as per the Govt order. Stay at home, Stay safe.

Holiday Homework is being assigned. Kindly acknowledge.Students are informed to complete the given activities with the help of parents. Follow the guidelines to protect yourself from COVID–19. Make a beautiful collage of your family. Help your mother in home chores. Prepare breakfast with the help of your mother. Learn the importance of money saving from your parents. Do basic Yoga everyday. Prepare a dance on a song, make a video and send it to your Class Teacher. Prepare a video of your singing and send it to your Class Teacher. Talk to your parents about Indian Vedic Culture and its scientific significance. Know our Indian History and its warriors. Arrange the bird’s feeder with the help of your parents. Understand the struggle, Ups & downs in the life of your parents to survive with all types of situations. Spend quality time with your grandparents. Prepare some basic craft work. Engage yourself in physical activities like indoor/outdoor games to boost up your strength. Improve your presentation skills.Parents are requested to help the children to complete the given activities along with academic work assignedby subject teachers.Looking forward to your kind co-operation.Thanks & RegardsOIPS

Summer Holiday Homework 2021-22

Happy

Summer

OXFORDI.P.S.

Self Introduction

Real Heroes of India

Pillars of Indian History

The Great Ashoka

The Great Chandragupta

The Great Shivaji

The Great Maharana Pratap

The Great Prithvi Raj Chouhan

The Great Guru Govind Singh

The Great Rani Hadi

The Great Rani Padmavati

International and National G.K.

Rivers of India

Our Universe

Countries/ States and their capitals

Community Helpers

Sexual Harassment

Seven Wonders

Pros and Cons of Mobile Phone Business icons

Dhirubhai AmbaniBill GatesJack MaZeff BezosWarren BuffettTim Cook

Name of founders- Whatsapp, Facebook,

Amazon, Uber, Youtube, Zomato

NASA Indian Army Navy Airforce Women Empowerment

Lata MangeshwarKalpana ChawlaSunita WilliamsKalpana SarojHima Das

Constitution of India– FundamentalRights and Duties

My contribution towards my Country Full forms- NASA, ISRO, DRDO,

GST, CAA, NRC Current affairs Prime Minister Narendra Modi Swachh Bharat Abhiyaan Skill Development Value of Savings Money Management Income Tax Important Innovations Ayurveda–Charaka, Shushruta, Dhanvantri

SPEAKING SKILLSStudents have to prepare at least 5 videos on the given topics and send them toyour class teacher (The best video will be uploated on the School Website,Instragram, Facebook and School Youtube Channel)

OXFORDI.P.S.

OXFORD INTERNATIONAL PUBLIC SCHOOL(An English Medium Co-Educational Sr. Secondary School. Affiliated to CBSE Delhi) Affl.No. 1730347

1. National Flag – Tiranga2. National Emblem – Lion capital of Ashoka (Sarnath)3. National Animal – Tiger4. National Anthem – Jana Gana Mana5. National Song – Vande Mataram6. National Flower – Lotus7. National Fruit – Mango8. Longest river in the world – Nile9. Highest mountain peak of the world – Mount Everest10. Financial Capital of India – Mumbai11. Name any ten rivers of India

Ganga, Yamuna, Saraswati, Kaveri, Godavari,Brahmaputra, Meghna, Krishna, Narmada, Mahanadi

Important Facts12. The longest river of India –Ganga13. The largest monument of India –The Statue of Unity14. The largest Island of India – Majuli15. The largest fresh water lake of India – Wular Lake16. The highest mountain peak of India – Kanchenjunga17. The biggest seaport of India – Jawaharlal Nehru Port18. The most populous state of India – Uttar Pradesh19. The least populous state of India – Sikkim20. The largest state of India – Rajasthan (area wise )21. The smallest state (area wise) – Goa22. The largest peninsular river of India – Godavari23. The biggest airport of India–Indira Gandhi International AirportState Symbols24. State Tree – Khejri25. State Flower – Rohida26. State Bird – Godawan or Great Indian Bustard27. State Animal – Chinkara (an antelope)28. State Game – BasketballImportant Fact29. The longest river of Rajasthan – Banas30. The highest mountain peak of Rajasthan – Gurushikhar

(1722m)31. Child help line number – 109832. Police control room phone number – 100

G.K. Questions33. What is veto power and which countries have veto

power of UNO?Ans. Veto power is the power or right vested in one branch of

the government to cancel or postpone the decisions,enactments etc. of another branch, especially the right ofa president, governor or other chief executive to rejectbills passed by the legislature. (i) China, (ii) France, (iii)Russia (iv) United kingdom, (v) USA have veto power.

34. Abbreviations:• UNO– United Nation Organisation

• LOC – Line of Control

• NASA– National Aeronautics and Space Administration

• ISRO– Indian Space Research Organisation

• ATM–Automated Teller Machine

• GST – Goods and Service Tax35. Name the seven wonders of the World.(i) The Great Wall Of China (ii) Petra Jordan(iii) Christ Redeemer Statue (iv) Machu Picchu(v) Pyramid Of Chichen Itza (vi) Roman Colosseum(vii) Taj Mahal36. Who Invented?

Television – J.L. BairdElectricity – Benjamin FranklinElectricity Bulb – Thomas EdisonMobile Phone – Martin Cooper

37 Name four Vedas.Ans. There are four vedas: The Rigveda, The Yajurveda, The

Samaveda and The Atharveda38. What is computer? How many parts does computer

have?Ans. A computer is an electronic machine that can solve dif-

ferent problems, process data, store & retrieve data andperform calculations faster and efficiently than humans.The four main parts of computer are:(a) Monitor (b) C.P.U. (c) Keyboard(d) Mouse

39. Describe Jantar Mantar of Jaipur.Ans. The Jantar Mantar monument is in Jaipur. It features the

world’s largest stone sundial and is a UNESCO WorldHeritage Site. It is located near City Palace and HawaMahal. The instruments allow the observations of astro-nomical positions with the naked eye. The observatoryconsists of nineteen instruments for measuring time, pre-dicting eclipses, tracking location of major stars as theearth orbits around the Sun.

Country & CapitalsCountry Capital

• United States of America Washington D.C.• China Beijing• France Paris• Russia Moscow• United Kingdom London• Australia Canberra• Bangladesh Dhaka• Bhutan Thimphu• Brazil Brasilia• Canada Ottawa• Germany Berlin• Israel Jerusalem• Italy Rome• Japan Tokyo• Nepal Kathmandu• New Zealand Wellington• Pakistan Islamabad• Sri Lanka Colombo• Switzerland Bern• United Arab Emirates Abu Dhabi

G.K. Worksheet

OXFORDI.P.S.

S.No States Name Capital1 Andhra Pradesh Hyderabad (Proposed Capital Amaravati)2 Arunachal Pradesh Itanagar3 Assam Dispur4 Bihar Patna5 Chhattisgarh Raipur6 Goa Panaji7 Gujarat Gandhinagar8 Haryana Chandigarh9 Himachal Pradesh Shimla10 Jharkhand Ranchi11 Karnataka Bengaluru (formerly Bangalore)12 Kerala Thiruvananthapuram13 Madhya Pradesh Bhopal14 Maharashtra Mumbai15 Manipur Imphal16 Meghalaya Shillong17 Mizoram Aizawl18 Nagaland Kohima19 Odisha Bhubaneswar20 Punjab Chandigarh21 Rajasthan Jaipur22 Sikkim Gangtok23 Tamil Nadu Chennai24 Telangana Hyderabad25 Tripura Agartala26 Uttar Pradesh Lucknow27 Uttarakhand Dehradun (Winter)

Gairsain (Summer)28 West Bengal Kolkata

Union Territories Names CapitalAndaman and Nicobar Islands Port BlairChandigarh ChandigarhDadra & Nagar Haveli and Daman & Diu DamanDelhi New DelhiJammu and Kashmir Srinagar (Summer)

Jammu (Winter)Lakshadweep KavarattiPuducherry PondicherryLadakh Leh

OXFORDI.P.S.

OXFORDI.P.S.

Write 10-10 sentences of each form of tense as per the chart given below.

OXFORDI.P.S.

Read this chart carefully. The Chart Shows various sources of perticular Vitamins and their deficiencies.Vitamins are required to keep our body healthy. Try to include this food items in your daily rutine diet.

OXFORDI.P.S.

Descripte the given picture and prepare a video, send it your friends andyour class teacher.

OXFORDI.P.S.

PROJECT WORKActivity 1 vius ?kj ij o vkl&ikl isM+k ssa ij ifjaMs yxk,A Save

BirdsTake 2 bowls. Keep these bowls on the terrace or in

the lawn. Keep grains in one bowl and water in the other.After a few days see different birds visiting your housefor food and water. (Use your art & craft project).

Activity 2 Plant a tree, Save the planet!Planting a tree is a life long investment. Plant a tree

such as (Neem / Peepal / Banyan Tree) in yourneighbourhood & nurture it. Click photographs along withyour parents while planting it and paste the photographson A4 colourful sheet.

Activity 3 Prepare a diet chart whichmaintain heathy diet during COVID 19pandemic.

Activity 4 Saving: An insurance for safefuture

What is the correct age to start saving? Why it isimportant to be financially independent? How does ourIndian culture inspire us for saving? Discuss with yourparents and grandparents about saving.

Activity 5Prepare a poster suggesting the tips

to prevent from COVID–19

OXFORDI.P.S.

Activity 7 Shrimad Bhagavat Gita is anincredible Granth because of its intrinsicvalue in the fundamental worth of life.

The perspective taken from Shrimad Bhagavat Gita isuniversal and belongs to all humankind. One may wonderwhat is the use of studying Shrimad Bhagavat Gita in thepresent day. How it is relevant to our practical life? Describethe knowledge and values, we get from Shrimad BhagawatGita.

Activity 8 Sanskrit is the most scientific languageand loved by NASA.

Learn any three shlokas of Sanskrit during this theSummer Vacation.•

Activity 10 Watch animatedmovie of The Great WarriorMaharana Pratap and Prepare avideo describing his bravery,sacrifices and contribution towardsour mother land.Video Link:

https://youtu.be/qFbzITp29SA

Activity 9 Prepare aKahawa With the help ofMother using Neem Giloy andother immunity boosteringredients as per the givenpictures.

OXFORDI.P.S.

Activity 11 Watch animatedmovie of Shri Guru Govind SinghJi and Prepare a video describing hisbravery, sacrifices and contributiontowards our mother land.

Activity 12 Pros and Cons of 5G Network.Prepare a video/PPT

Activity 13 Prepare a video on this topicby giving answers of the questions given below:1. Why is English called an international

language?2. What is the importance of English for media

industry?3. How has English become an essential part of

the internet world?

Activity 14 These are some business icons of the world-like Bill Gates, Jack-Ma,Jeff Bezos, Warren Buffett, Mukesh Bhai Ambani, Mark Zuckerberg, Elon Musk, RatanTata, Azim Prem Ji etc.

Who is your idol business icon who inspires you a lot? Prepare a video and describetheir journey towards success.

Subjective Type Questions

a

a

a

OXFORD INTERNATIONAL PUBLIC SCHOOL

Class XII

2021-22

HOLIDAY HOME WORK (CHEMISTRY)

LESSON 1 SOLID STATE Q.1 An element has body centered cubic structure with a cell edge of 3.0 Å. The density of the metal is 2 amu/Å

3 . How

many atoms are present in 243 × 1024

amu of the element.

Q.2 (a) If the density of crystalline CsCl is 3.988 g/cm

3, calculate the volume occupied by a single unit cell in the crystal

(b) Calculate the smallest Cs-to-Cs internuclear distance which is equal to the length of the side of a cube

corresponding to the volume of one CsCl ion pair.

(c) Calculate the smallest Cs-to-Cl internuclear distance in the crystal, assuming each Cs+ ion to be located in the

centre of a cube with Cl– ions at each corner of the cube.

Q.3 A mineral of iron contains an oxide containing 72.36% iron by mass and has a density of 5.2 g/cc. Its unit cell

is cubic with edge length of 839 pm. What is the total number of atoms (ions) present in each unit cell ? (Fe–56, O-

16)

Q.4 An ionic solid AB2 isomorphous to the rutile structure (a tetragonal system with effective number of formula units = 2) has

edge lengths of the unit cell of 4Å, 4Å and 7Å. Calculate the density of the substance if its formula weight is 80. Take NA =

6 × 1023

and express your answer in mg/cc using four significant digits.

Q.5 In an ionic solid r(+) = 1.6 Å and r(–) = 1.864 Å. Use the radius ratio rule to determine the edge length of the cubic unit

cell in Å.

Q.6 The edge length of the unit cube of diamond is 356.7 pm and this cube contains 8 carbon atoms. Calculate :

(a) the distance dC–C between carbon atoms, assuming them to be spheres in contact;

(b) the fraction of the total volume that is occupied by carbon atoms.

Q.7 Metallic gold crystallizes in the face-centered cubic lattice. The length of the cubic unit cell

(a = 4.070 Å.)

(a) What is the closest distance between gold atoms ?

(b) How many ‘‘nearest neighbours’’ does each gold atom have at the distance calculated in (a) ?

(c) What is the density of gold ?

(d) Prove that the packing factor for gold, the fraction of the total volume occupied by the atom themselves, is 0.74

Q.8 Silver has an atomic radius of 144 pm and the density of silver is 10.6 g cm–3

. To which type of cubic crystal, silver

belongs ?

Q.9 AgCl has the same structure as that of NaCl. The edge length of unit cell of AgCl is found

to be 555 pm and the density of AgCl is

5.561 g cm–3

. Find the percentage of sites that are unoccupied.

Q.10 A crystal of lead(II) sulphide has NaCl structure. In this crystal the shortest distance between Pb+2

ion and S2–

ion is

297 pm. What is the length of the edge of the unit cell in lead sulphide? Also calculate the unit cell volume.

r Na

r Cl

Q.11 If NaCl is doped with 10-3 mol % of SrCl2, what is the concentration of cation vacancy ?

Q.12 A cubic unit cell contains manganese ions at the corners and fluoride ions at the centre of each edge.

(a) What is the empirical formula?

(b) What is the co-ordination number of the Mn ion?

(c) Calculate the edge length of the unit cell if the radius of Mn ion is 0.65 Å and that of F- ion is 1.36 Å.

(d) Calculate the density of the compound

(Mn = 55, F = 19)

Q.13 Metallic gold crystallizes in fcc lattice. The length of the cubic unit cell is a = 4.07 Å.

(a) What is the closest distance between gold atoms

(b) How many ‘‘nearest neighbours’’ does each gold atom have at the distance calculated in (a).

(c) What is the density of gold ?

(d) Provethatthepackingfractionof goldis0.74.

Q.14 A closed packed structure of uniform spheres has the edge length of 534 pm. Calculate the radius of sphere, if it exist

in (a) simple cubic lattice (b) BCC lattice (c) FCC lattice

Q.15 An element crystallizes into a structure which may be described by a cubic type of unit cell having one atom on each

corner of the cube and two atoms on one of its body diagonals. If the volume of this unit cell is

24 × 10–24

cm3 and density of element is

7.2 g cm–3

, calculate the number of atoms present in 200 g of element.

Q.16 Xenon crystallizes in the face-centered cubic lattice and the edge of the unit cell is 620 pm. What is the nearest

neighbour distance and what is the radius of xenon atom ?

Q.17 The two ions A+ and B

– have radii 88 and

200 pm respectively. In the closed packed crystal of compound AB, Predict the

co-ordination number of A+.

Q.18 Gold crystallizes in a face centered cubic lattice. If the length of the edge of the unit cell is 407 pm, calculate the

density of gold as well as its atomic radius assuming it to be spherical. Atomic mass of gold = 197 amu.

Q.19 An element crystallizes in a structure having FCC unit cell of an edge 200 pm. Calculate the density, if 200 g of this

element contains 24 × 1023

atoms.

Q.20 KCl crystallizes in the same type of lattice as does NaCl. Given that

(a) The ratio of the sides of unit cell for KCl to that for NaCl and

(b) Theratio ofdensities of NaCl to thatfor KCl.

0.5 and r Na

0.7. Calculate :

Q.21 An element A (Atomic weight = 100) having bcc structure has unit cell edge length

400 pm. Calculate the density of A and number of unit cell and number of atoms in 10 gm of A.

Q.22 Prove that the void space percentage in zinc blende structure is 25%

Q.23 A unit cell of sodium chloride has four formula units. The edge of length of the unit cell is 0.564 nm. What is the

density of sodium chloride.

Q.24 In a cubic crystal of CsCl (density = 3.97 gm/cm3) the eigth corners are occupied by Cl

– ions with Cs

+ ions at the

centre. Calculate the distance between the neighbouring Cs+ and Cl

– ions.

Q.25 KF has NaCl structure. What is the distance between K+ and F

– in KF if density of KF is 2.48 gm/cm

3.

Q.26 The composition of a sample of wustite is Fe0.93O1.0. What percentage of iron is present in the form of Fe(III)?

Q.27 RbI crystallizes in bcc structure in which each Rb+ is surrounded by eight iodide ions each of radius 2.17 Å. Find the

length of one side of RbI unit cell.

Q.28 Find the size of largest sphere that will fit in octahedral void in an ideal FCC crystal as a function of atomic radius

‘r’. The insertion of this sphere into void does not distort the FCC lattice. Calculate the packing fraction of FCC

lattice when all the octahedral voids are filled by this sphere.

Q.29 Potassium crystallizes in a body-centered cubic lattice with edge length, a = 5.2 Å.

(a) What is the distance between nearest neighbours?

(b) What is the distance between next-nearest neighbours ?

(c) How many nearest neighbours does each K atom have ?

(d) How many next-nearest neighbours does each K atom have ?

r K

f 2 .

(e) What is the calculated density of crystalline potassium?

LESSON 2 SOLUTION

Q.1 At 10ºC, the osmotic pressure of urea solution is 500 mm. The solution is diluted and the temperature is raised to

25ºC, when the osmotic pressure is found to be 105.3 mm. Determine extent of dilution.

Q.2 At 30ºC Benzene and toluene have vapour pressure in the pure state 119.6 mm and 36.7 mm respectively. What are

the partial vapour pressure of each of these components and the total pressure over a solution consisting of equal

weights of these two components at 30ºC? What is the composition of the vapour in equilibrium with the solution at

this temperature? Comments the results.

Q.4 An organic liquid, A, is immiscible with water. When boiled together with water, the boiling point is 90ºC at which

the partial vapour pressure of water is 526 mm Hg. The atmospheric pressure is 736 mm Hg. The weight ratio of the

liquid and water collected is 2.5: 1. What is the molecular weight of the liquid ?

Q.5 A current of dry air is passed through a bulb containing 5 g of a solute in 100 g of water and then through water

alone. The losses in weight of the solution and pure water were respectively 0.78 g and 0.02 g. Calculate: (a) relative

lowering of vapour pressure and (b) molecular weight of solute.

Q.6 If boiling point of an aqueous solution is 100.1ºC. What is its freezing point? Given latent heat of fusion and

vaporization of water are 80 cal g-1 and 540 cal g–1 respectively.

Kf for H2O = 1.86 K Kg mol–1

.

Q.7 A storage battery contains a solution of H2SO4 38% by weight. At this concentration, vant Hoff factor is 2.50. At

what temperature will the battery content freeze? Kf = 1.86 K Kg mol–1

.

Q.8 1000 g of 1 m sucrose solution in water is cooled to -3.534ºC. What weight of ice would be separated out at this

temperature? K (H O) = 1.86 K Kg mol–1

Q.9 A current of dry air was passed through a series of bulbs containing 1.25 g of a solute A2B in 50 g of water and then

through pure water. The loss in weight of the former series of bulbs was 0.98 g and in the later series 0.01 g. If the

molecular weight of A2B is 80 calculate degree of dissociation of A2B.

Q.10 What must be the concentration of an aqueous solution of common salt if it is to be isotonic with a solution of this

substance which freezes at -0.0186ºC ? (Assuming NaCl is fully ionized in the first solution).

Q.11 An aqueous solution containing 288 gm of a non-volatile compound having the stoichiometric composition CxH2xOx

in 90 gm water boils at 101.24°C at 1.00 atmospheric pressure. What is the molecular formula ?

Kb(H2O) = 0.512 K mol–1

kg

Tb(H2O) = 100°C

Q.12 The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 7 gm of the salt per 100 gm of water

at 100°C is 70%. If the vapour pressure of water at 100°C is 760 mm. Calculate the vapour pressure of the solution.

Q.13 A 10% solution of cane sugar has undergone partial inversion according to the reaction:

Sucrose + Water Glucose + Fructose. If the boiling point of solution is 100.27°C.

(a) What is the average mass of the dissolved materials?

(b) What fraction of the sugar has inverted?

Kb(H2O) = 0.512 K mol–1

kg

Q.14 1.5 g of a monobasic acid when dissolved in 150g of water lowers the freezing point by 0.165°C. 0.5 g of the same acid

when titrated, after dissolution in water, requires 37.5 ml of N/10 alkali. Calculate the degree of dissociation of the acid (Kf

for water = 1.86°C mol–1

).

Q.15 Sea water is found to contain 5.85% NaCl and 9.50% MgCl2 be weight of solution. Calculate its normal boiling point

assuming 80% ionisation for NaCl and 50% ionisation of MgCl2 [Kb(H2O) = 0.51 kg mole–1

K].

Q.16 A complex is represented as CoCl3.xNH3. It's 0.1 molal solution in aq. solution shows

Tf = 0.558°C. Kf for H2O is 1.86 K mol–1

kg. Assuming 100% ionisation of complex and coordination no. of Co is

six, calculate formula of complex.

2.20

2

6 6

2

4

Q.17 Calculate the boiling point of a solution containing 0.61 g of benzoic acid in 50g of carbon disulphide assuming 84%

dimerization of the acid. The boiling point and Kb of CS2 are 46.2°C and 2.3 K kg mol–1

, respectively.

Q.18 Phenol associates in benzene to a certain extent to form a dimmer. A solution containing

20 × 10–3

kg phenol in 1 kg of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that

has dimerised. Kf for benzene = 5.12 kg mol–1

K.

Q.19 Dry air was drawn through bulbs containing a solution of 40 grams of urea in 300 grams of water, then through bulbs

containing pure water at the same temperature and finally through a tube in which pumice moistened with strong

H2SO4 was kept. The water bulbs lost 0.0870 grams and the sulphuric acid tube gained 2.036 grams. Calculate the

molecular weight of urea.

Q.20 Vapour pressure of C6H6 and C7H8 mixture at 50°C is given by P(mm Hg) = 180 XB = 90, where XB is the mole

fraction of C6H6. A solution is prepared by mixing 936g benzene and 736g toluene and if the vapours over this

solution are removed and condensed into liquid and again brought to that temperature of 50°C, what would be mole

fraction of C6H6 in the vapour state?

Q.21 When the mixture of two immiscible liquids (water and nitrobenzene) boils at 372 K and the vapour pressure at this

temperature are 97.7 kPa (H2O) and 3.6 kPa (C6H5NO2). Calculate the weight % of nitrobenzene in the vapour.

Q.22 The vapour pressure of a certain liquid is given by the equation :

Log10P = 3.54595 – 313.7

T

+ 1.40655 log

10T where P is the vapour pressure I mm and

T = Kelvin temperature. Determine the molar latent heat of vaporization as a function of temperature. Calculate the

its value at 80 K.

Q.23 The cryoscopic constant for acetic acid is 3.6 K kg/mol. A solution of 1 g of a hydrocarbon in 100 g of acetic acid

freezes at 16.14°C instead of the usual 16.60°C. The hydrocarbon contain 92.3% carbon. What is the molecular

formula?

Q.24 A solution of crab heamocyanin, a pigmented protein extracted from crabs, was prepared by dissolving 0.750 g in 125

cm3 of an aqueous medium. At 4°C an osmotic pressure rise of 2.6 mm of the solution was observed. The solution has a

density of 1.00 g/cm3. Determine the molecular weight of the protein.

Q.25 A storage battery contains a solution of H2SO4 38% by weight. What will be the Van't Hoff factor if the Tf (experiment)

is 29.08. [Given Kf = 1.86 mol–1

Kg]

Q.26 A decimolar solution of potassium ferrocyanide is 50% dissociated at 300K. Calculate the osmotic pressure of the

solution. (R = 8.314 JK–1

mol–1

)

LESSON 3 : ELECTROCHEMISTRY Q. 1 Determine the feasibility of the reaction :

2Al(s) + 3Sn4+

(aq) 2Al3+

+ 3Sn2+

(aq)

Given that 0

Al/ Al3 = + 1.66 V

E0 Sn / Sn 4

= – 0.15 V

Q. 2 The overall formation constant for the reaction of 6 mol of CN– with Cobalt(II) is 1 x 10

19. Calculate the formation

constant for the reaction of 6 mol of CN– with Cobalt(III).Given that,

Co(CN) –3

+ e Co(CN) –4

EºRp = 0.83 V

Co+3

+ e Co+2

EºRp = 1.82 V

Q.3 The standard free energy change for the reaction:

H2 (g) + 2AgCl(s) 2Ag(s) + 2H+

(aq) + 2Cl–

(aq)

is –10.26 kcal mol-1 at 25ºC. A cell using above reaction is operated at 25ºC under PH = 1 atm, [H+] and [Cl

–] = 0.1.

Calculate e.m.f.of cell.

Q.4 The e.m.f. of cell Zn | ZnSO4 || CuSO4| Cu at 25ºC is 0.03 V and the temperature coefficient of e.m.f. is –1.4 × 10–4

V per degree. Calculate heat of reaction for the change taking place inside the cell.

Q.5 EMF diagram for iron is given as:

Eº (volts) FeO 2–

Fe3+

E

–0.445

(Fe = + 6) (Fe = + 3)

Fe2+

Fe0

(Fe = + 2) (Fe = + 0) Determine the value of E

0 2– 2 .

FeO4 / Fe

Q.6 Calculate the equilibrium constant for the reaction ;

Fe + CuSO4 FeSO4 + Cu at 25ºC.

Given E0 2 = 0.44V

Fe/ Fe

E0 2 = –0.337V

Cu/ Cu

Q.7 Calculate the maximum work that can be obtained from the cell.

Zn |Zn2+

(1M) || Ag+ (1M)| Ag

Given that

and

0

Zn / Zn

0

Ag/ Ag

2 = 0.76 V

= – 0.80 V

Q.8 The voltage of the cell :

Pb|PbSO4| Na2SO4.10H2O (salt)|Hg2SO4| Hg

is + 0.9647 at 25°C. The temperature coefficient is 1.74 × 10–4

V. K–1

.

(i) What is the cell reaction?

(ii) Calculate the values of G,

Q.9 For the cell process :

S and H.

Sn(s) + Pb+2

(aq) Pb(s) + Sn+2

(aq) Calculate ratio of Pb+2

to Sn+2

ion concentration for spontaneity .

Given

E0 2

Sn /Sn

E0 2

Pb / Pb

= – 0.136 V

= – 0.126 V

Q.10 Determine the solubility and solubility product of Co2[Fe(CN)6)] in water at 25ºC from the following data : Conductivity of

saturated solution of Co2[Fe(CN)6] = 2.06 × 10–6

ohm–1

cm–1

and that of water = 4.1 × 10–7

ohm–1

cm–1

. The ionic molar

conductivities of Co2+

and [Fe(CN)6]4–

are 86 and 444 ohm–1

cm2 mol

–1 respectively.

Q.11 The conductivity of a saturated aqueous solution of Ag2C2O4 is 3.8 x 10–5

ohm–1

cm–1

at 25ºC. Determine the molar

conductivity of oxalate ion. Given at 25ºC, conductivity of water is 6.2 x 10–6

ohm–1

cm–1

and molar conductivity of Ag+ at

infinite dilution is 62 ohm–1

cm2mol

–1 and Ksp of Ag2C2O4 is 1.1 x 10

–11 ?

Q.12 A galvanic cell is consisted of metallic zinc plate immersed in 0.1 M Zn(NO3)2 solution and a lead plate immersed in

0.02M Pb(NO3)2 solution. Calculate emf of the cell. Given :

E0 2

Zn / Zn = – 0.76V and E

0 2

Pb = – 0.13V

Q.13 Construct the galvanic cell by coupling the following pairs of electrodes Justify your answer:

(i) Cu(s)/Cu2+

(aq), Ag+ (aq)/Ag(s)

(ii) Zn(s)/Zn+2

(aq), Cu2+

(aq)/Cu(s)

(iii) Mg(s)/Mg2+

(aq), Ni(s)/Ni2+

(aq) 0

Cu2

E0

/ Cu

= 0.34 V

= 0.80 V

and

Ag / Ag

E0 2

Zn / Zn

E0 2

Ni / Ni

= – 0.76 V

= – 0.25 V

Q.14 Calculate the potential of the standard Iron-Cadmium cell after the reaction has proceeded to 80% completion.

Initially 1 M of each taken and Eº for cell = 0.04 V.

Q.15 The e.m.f. of the cell, H2(g) |Buffer| |Normal calomel electrode is 0.6885 volt at 25ºC when barometric pressure is

760 mm Hg. What is pH of the buffer solution. Eºcalomel = 0.28 volt

Q.16 A 200 W, 110 V incandescent lamp is connected in series with an electrolytic cell of negligible resistance containing a solution of ZnCl2. What weight of Zn will be deposited from the solution on passing current for 30 minutes? (At.wt.

of Zn = 65.4)

Q.17 A current of 4 amperes was passed for 2 hours through a solution of copper sulphate when 5.0 g of copper was

deposited. Calculate the current efficiency (Cu = 63.5).

Q.18 10 g fairly concentrated solution of CuSO4 is electrolysed using 0.01 Faraday of electricity. Calculate:

0.77

E

E

/Pb

E

2

E2

4

(a) the weight of resulting solution.

(b) the number of equivalents of acid or alkali in solution. (At weight of Cu = 63.5)

Q.19 The density of copper is 8.94 g ml–1

. Find out the number of coulomb needed for the electro-deposition on a plate of

an area of 10 × 10 cm2 to a thickness of 10

–2 cm using CuSO4 solution as electrolyte. Atomic weight of Cu = 63.6.

Q.20 A zinc rod of 25 g was kept in 100 ml of one molar copper sulphate solution. After certain time the molarity of Cu2+

in solution dropped to 0.8 M. Calculate

(a) molarity of sulphate ion.

(b) weight of zinc rod at that instant.

Q.21 The emf of the cell Ag|AgI|KI(0.05M)|| AgNO3(0.05M) | Ag is 0.788 V. Calculate the solubility product of AgI.

Q.22 After electrolysis of NaCl solution with inert electrodes for a certain period of time. 600 mL of the solution was left.

Which was found to be 1N in NaOH. During the same time, 31.75 g of Cu was deposited in the copper voltameter in

series with the electrolytic cell. Calculate the percentage yield of NaOH obtained.

Q.23 In two vessels each containing 500 ml water , 0.5 m mol of aniline (kb = 10–9

) and 25 m mol of HCl are added

separately. Two hydrogen electrodes are constructed using these solutions. Calculate the emf of cell made by

connecting them appropriately.

Q.24 From the standard potentials shown in the following diagram, calculate the potentials E1 and E2 .

E1

BrO3 0.54V BrO 0.45V

1 Br2

Q.25 During the discharge of a lead storage battery the sulphuric acid fell from 1.294 to 1.139 g ml–1

. H2SO4 of density

1.294 g mL–1

is 39% and that of density 1.139 g mL–1

is 20% by weight. The battery holds 3.5 L of acid and the

volume practically remains constant during the discharge. Calculate the number of ampere hours for which the

battery must have been used. The discharging reactions are

Pb SO 2

PbO2 4H

PbSO4 2e

SO2 2e

(anode)

PbSO4 2H2O (cathode)

1.07V Br

4

3 2 3

Instruction—

1. Select one project for holiday homework.

2. Use filepages.(don’t use rough pages)

3. You can use this below url to get more instruction or answer

https://studyres.com/doc/1861347/investigatory-project-for-class-xii-biology

Q.26 Same quantity of electricity is being used to liberate iodine (at anode) and a metal x (at

cathode). The mass of xdeposited is 0.617 g and the iodine is completely reduced by 46.3 cc of

0.124 M sodium thiosulphate. Find the equivalent mass of x

Q.27 Estimatethe cell potential of a Danielcellhaving 1 M Zn++

& originallyhaving 1 M Cu++

after sufficientNH3

has been added to thecathodecompartmentto make NH3 concentration2 M. Kf for [Cu(NH3)4]2+

= 1 × 1012

, E°

for the reaction,

Zn + Cu2+

Zn2+

+ Cu is 1.1 V.

Q.28 Consider the cell Ag | AgBr(s) | Br– ||Ag Cl

–(s)

, Ag |C|

– at 25°C. The solubility product constants of

AgBr & AgCl are respectively 5 × 10–13

&

1 × 10–10

. For what ratio of the concentrations of Br– & Cl

– ions would the emf of the cell be zero ?

Q.29 The pKsp of AgI is 16.07. If the E° value for Ag+ | Ag is 0.7991 V. Find the E° for the half cell

reaction AgI(s) + e–Ag + I–

Q.30 Kd for complete dissociation of [Ag(NH3)2]+ into Ag

+ and 2NH3 is 6 × 10

–8 . Calculate E° for

the following halfreactions ;

Ag(NH ) + + e

– Ag + 2NH Ag

+ + e

– Ag, E° = 0.799 V

HOLIDAY HOME WORK (BIOLOGY)

INVESTIGATORY PROJECT FOR CLASS XII BIOLOGY

1. Project Report on Malnutrition

2. Biology Project Report on Evolution

3. Biology Project Report on DNA replication

4. Project Report on bio diversity

5. Biology Project Report on ABO blood grouping in human beings

6. Biology Project Report pollination

7. Biology Project Report on asexual reproduction

8. Biology Project Report on male and female human reproductive system

9. Project Report on reproductive health

10. Biology Project Report on haemophilia

11. Project Report on Microbes

12. Biology Project Report on Cancer

13. Biology Project Report on aids

14. Biology Project Report on malaria

15. BIOLOGY PROJECT REPORT ON IMMUNE SYSTEM

HOLIDAY HOME WORK (MATHS)

HOLIDAY HOME WORK (PHYSICAL

EDUCATION)

1. Lab Manual

YOGA,To core five lifestyle disease

1. Obesity

2. Diabetes

3. Asthma

4. Hypertension

5. Back pain

Asana to cure them

Procedure, Benefit, Contradiction

1-Pada hastasana

2-Urdhva hastasana

3-Trikonasana

4-Sukhasana

5-Chakrasana

6-Parvatasana

7-Mtsayasana

8-Bhajangusana

9-Shavsana

10-Ardh chakrasan

11-Urakshasana

12-Shalabhasana

13-Gomukhasana

14-Tadasana

HOLIDAY HOME WORK (INFORMATICS

PRACTICES)

PRACTICAL FILE WORK 1. Write SQL commands for (a) to ( j) and write output for (k) on the basis of Teacher relation givenbelow.

No Name Age Department Date of Join Salary Sex

1. Jigal 34 Computer 10/01/97 12000 M

2. Sharmila 31 History 24/03/98 20000 F

3. Sandeep 32 Maths 12/12/96 30000 M

4. Sangeeta 35 History 01/07/99 40000 F

5. Rakesh 42 Maths 05/09/97 25000 M

6. Shyam 50 History 27/02/97 30000 M

7. Shiv Om 44 Computer 25/02/97 21000 M

8. Shalakha 33 Maths 31/07/97 20000 F

a) To show all information about the teacher of history department.

b) To list the names of female teachers who are in Maths department

c) To list names of all teachers with their date of joining in ascending order.

d) To display students name, fee,age for male teacher only

e) To count the number of teachers with age>23. f) To insert a new row in the TEACHER table with the following data:

9,”Raja”,26,”Computer”,13/05/95,2300,”M”. g) To show all information about the teachers in this table

h) Add a new column named “Address”.

i) Arrange the whole table in the alphabetical order to name

j) Display the age of the teachers whose name starts with ‘S,.

k) Give the output of following statement.

(i) Select COUNT(distinct department) from TEACHER.

(ii) Select MAX(Age)from Teacher where sex=”F”

(iii) Select AVG(Salary) from Teacher where Dateofjoin<12/07/96

(iv) Select SUM(Salary) from teacher where Dateofjoin<12/07/96

2. Write SQL commands for (a) to ( h) and write output for (i) on the basis of EMP relation givenbelow.

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

7839 REA MANAGER 67 12-DEC-98 5000 0 10

1234 PREM CLERK 87 11-FEB-77 12000 1500 20

6754 SITA MANAGER 89 12-MAR-99 10000 1000 20

6574 GITA SALESMAN 98 11-JUN-99 9000 0 30

9876 HONEY CLERK 65 12-JUN-00 12000 800 20

8976 REEMA SALESMAN 91 10-SEP-88 6000 100 30

(a) Display names of employees whose names include either of the substring “TH” or “LL”.

(b) Display data of all employees sorted by their department, seniority and salary.

(c) Find all the employees who have no manager.

(d) To display all employees who were hired during 1995.

(e) Show the average salary for all departments with more than 3 people for a job.

(f) Find out number of employees having ‘MANAGER’ as job.

(g) Create view DEPT20 with name and the salary of employees for dept 20.

(h) Display department no. and number of employees in each department.

(i) Find the output of the following :

1. SELECT SYSDATE FROM DUAL;

2. SELECT ENAME,SAL FROM EMPLOYEE WHERE DEPTNO=20;

3. SELECT COUNT(*) FROM EMP;

4. SELECT AVG(SAL) FROM EMP;

3. Write SQL commands for the statements (i) to (vi) on the basis of the table EMPLOYEE:

Name EmpNo DeptNo Job Sal Comm

G. Hussain 2098 10 President 7000

Pallav 3099 30 Manager 9000 1400

Y.D. Sharma

8001 20 Clerk 8500

Bhawna 7901 10 President 4520 300

A. Dasgupta 5400 20 Analyst 6580

P. Arora 3400 10 Clerk 12000

Col. Singhvi 2100 30 Manager 1200 500

Amit 3100 30 Analyst 3250

A D’souza 2211 10 Clerk 6900

i. Show sum and average salary for marketing deptt.

ii. Check all employees have unique names.

iii. Find al employess whose deptt is same as of ‘Amit’.

iv. Increase the salary of all employees by 10%,

v. Find the deptt that is paying max salaries to its employees.

vi. Display the details of all the employees having salary less than 10000.

HOLIDAY HOME WORK (PHYSICS)