Past Paper Chemistry 1st Year BISE Lahore 2006 and 2005

7/24/2019 Past Paper Chemistry 1st Year BISE Lahore 2006 and 2005

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Inter (Part-l) Lahore Board 2006

Chemistry Paper I (Objective Type)

Time Allowed: 20 Minutes Max. Marks: I7

Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B,

C and D to each, question are given. Which answer you consider correct, fill the circle in front of A, B, C or

D with Marker or Pen ink to each question on the answer sheet provided.

1. One mole of SO2 contains oxygen atoms:

(A) 6.02x1023

(B) 12.04x1023

(C) 1 mole (D) 3 mole

2. Which gas has highest diffusion rate:

(A) SO2 (B) CO2 (C) NH3 (D) Cl2

3. Which of the following is the pseudo solid:

(A) CaF2 (B) Glass (C) NaCl (D) All

4. Quantum number values for 2P orbitals are:

(A) n = 2, l = 1 (B) n = 1, l = 2 (C) l = 0, n = 2 (D) n = 2, l = 0

5. Which of the HX has highest %age of ionic character:

(A) HB (B) HCl (C) HI (D) HF

6. H+

+ OH-

H2O the change in enthalpy for reaction is called:

(A) Heat of reaction (B) Heat of formation(C) Heat of neutralization (D) Heat of combustion

7. Molarity of a pure water is:

(A) 1 (B) 18 (C) 55.5 (D) 6

8. The molal boiling point constant is the ratio of the elevation in boiling point to:(A) Milarity (B) Molality (C) Mole fraction of solvent(D) Mole fraction of solute

9. In the reaction 2Fe + 3Cl2 2FeCl3:

(A) Fe is reduced (B) Fe is oxidized (C) Cl2 is oxidized (D) None

10. Decomposition of nitrogen penta oxide has order of reaction:

(A) 0 (B) 1 (C) 2 (D) 3


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(SECTION l)

Chemistry Paper I (Essay Type)

Time Allowed: 2.40 Hours Max. Marks: 68

Note: Out of Q. No. I, 2, 3 and 4 write any Twenty-Two (22) short answers. While writing answer write

question No and its part carefully. Each part carries two marks. 44

1. (i) 23g of sodium and 238g of uranium have equal number of atoms in them. Justify?

(ii) 180g of glucose and 234g of sucrose have the same number of molecules but different

number of atoms present in them give reason.

(iii) How the decolorization of undesired colours is carried out from freshly prepared crystalline

substance?

(iv) Define absolute zero?

(v) Explain with reason evaporation cause cooling.

(vi) State Moseleys law.

(vii) Pi bond is more diffused than sigma bond. Justify it.

(viii) Is it true that H and E have the same values for the reactions taking place in the solution

state? Explain it.

(ix) What is ionic product of water? Define pH?

(x) The concentration in term of molality is independent of temperature but molarity depends

upon temperature. Explain with reason.

(xi) What is meant by standard hydrogen electrode?

(xii) Define energy activation?

(SECTION ll)

Note: Attempt any THREE questions

2. (a) Give a method for the determination of % of C and H in the given organic compound.

(b) Write down the main four characteristics of an ideal solvent.

(c) Calculate the mass of 1 dm3

of N2 gas at 30oC and 2000 mmHg pressure, considering that

N2 is behaving ideally.


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3. (a) Give the classification of solids on the bases of chemical bond and give characteristic of ionic

solids.

(b) Explain dual nature of matter.

(c) Calculate mass of an electron when e/m = 1.7588x1011

coulombs/kg

4. (a) Define molarity and molality. Differentiate between hydration and hydrolysis giving

examples.

(b) Hydrazine burns in oxygen to give N2 and H2O as follow:

N2H4 + O2 N2 + 2H2O

1.00g of N2H4 is burned in a bomb calorimeter. An increase of temperature 3.51oC is noted.

The heat capacity of calorimeter is 5.5kj-1

. Calculate the amount of heat evolved.

5. (a) What is electrode potential? Give three applications of electrochemical series.

(b) Explain energy of activation.

(c) Write a note on colligative properties.

6. (a) Write the rules for balancing redox reduction by oxidation number method.

(b) Explain the terms:

(i) Half life.

(ii) Order of reaction.


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Chemistry Paper I (Objective Type)

Time Allowed: 20 Minutes Max. Marks: I7

Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B,

C and D to each, question are given. Which answer you consider correct, fill the circle in front of A, B, C or

D with Marker or Pen ink to each question on the answer sheet provided.

1. Which of the following compound has the highest % of oxygen by weight:

(A) CH3OH (B) C2H5OH (C) HCOOH (D) H2O

2. The ideal gas constant R when expressed in dm3 atm/k units have a value of:

(A) 0.0821 (B) 1.0821 (C) 82.21 (D) 82.1

3. Which of the following is pseduo solid:

(A) CaF2 (B) Glass (C) NaCl (D) Diamond

4. Maximum number of electrons in a subshell is given by:

(A) 2l+1 (B) 2l-1 (C) 2(2l+1) (D) 2(2l-1)

5. Which of the following molecules has a coordinate covalent bond:

(A) NaCl (B) HCl (C) NH4Cl (D) AlCl3

6. Spontaneous reaction are:

(A) 14 (B) 7 (C) 1x10

-14

(D) 1x10

14

7. The value of ph and poh of pure water at 25oC is approximately:

(A) 1 (B) 18 (C) 55.5 (D) 6

8. Depression in the freezing points is directly proportional to:

(A) Molarity of solution (B) Molarity of solvent(C) Molality of solvent(D) Molality of solution

9. Reduction always takes place:

(A) At anode (B) At cathode (C) Both electrodes (D) None

10. Larger the surface area of the reactant molecules:

(A) Lower will be the rate of reaction

(B) Higher will be the rate of reaction

(C) The rate of reaction will remain unaffected

(D) The rate may increase or decrease


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(SECTION l)

Chemistry Paper I (Essay Type)

Time Allowed: 2.40 Hours Max. Marks: 68

Note: Out of Q. No. I, 2, 3 and 4 write any Twenty-Two (22) short answers. While writing answer write

question No and its part carefully. Each part carries two marks. 44

1. (i) Concept of limiting reactant is not applicable to the reversible reactions. Explain it.

(ii) Molecular formula is multiple of empirical formula. Give an example.

(iii) A gas occupies 100 dm3

at 283 K. What will be it volume at -273oC at constant pressure?

(iv) Evaporation of liquid cause cooling, why?

(v) Define Hunds rulw?

(vi) Differentiate between mobile phase and stationary phase?

(vii) Why sigma bind is more stronger than pi bond?

(viii) What do you mean by:

(1) System

(2) Enthalpy

(ix) Define Le-Chateliers principle?

(x) Explain why CuSO4 give acidic solution when put in H2O.

(xi) How the power is generated by using fuel cell?

(xii) Define order of reaction with example?

(SECTION ll)

Note: Attempt any THREE questions

2. (a) What is limiting reactant? How does it control the quantity of product formed? Explain with

3 examples.

(b) Write down the main four characteristics of solvent selected for crystallization of a

compound.

(c) Working at vaccum line a chemist isolated a gas in weighing bulb with volume of 255 cm3 at

a temperature of 25oC and under the a pressure in the bulb of 100 torr. The gas weighing

12.1 mg. What was the formula mass of this gas?


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3. (a) Write down the properties of metallic crystals.

(b) Derive the equation of radius of revolving electron in nth orbit.

4. (a) State and explain Raoults law in three different forms.

(b) 10.16 g of graphite is burnt in a bomb calorimeter and the temperature rise recorded in 3.87

K. Calculate the enthalpy of combustion of graphite if the specific heat capacity of the

calorimeter (bomb, water etc) is 86.02 KJ/K/mol.

5. (a) Define energy of activation? Hoe the potential energy of the exothermic and Endothermic

reactions can be explained on its basis?

(b) Give Lowry Bronsted acid base concept and explain with suitable examples.

(c) Give applications of equilibrium constant.

6. (a) Explain VESPER theory. Discuss the structure of BF3 and NH3 with reference to this theory.

(b) Explain the difference between electrolytic and voltaic cell with example.

Past Paper Chemistry 1st Year BISE Lahore 2006 and 2005

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