VIT – PAST PAPERS

CHEMISTRY - UNSOLVED PAPER - 2008

SECTION – I

Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is

correct. Indicate you choice of the correct answer for each part in your answer-book by

writing the letter (a), (b), (c) or (d) whichever is appropriate

01 ?

a.

b.

c.

d.

Problem

675K3 3 3CH CH HNO

3 2 2CH CH NO

3 2 2 3 2CH CH NO CH NO

3 22CH NO

3 22CH NO

02When acetamide is hydrolysed by boiling with acid, the product obtained is

a. acetic acid

b. ethyl amine

c. ethanol

d. acetamide

Problem

Problem03Which will not go for diazotization?

a.

b.

c.

d.

6 5 2C H NH

6 5 2 2C H CH NH

Problem04Secondary nitro alkanes can be converted into ketones by using Y. Identify Y from

the following

a. aqueous HCl

b. aqueous NaOH

c.

d. CO

4KMnO

Problem05Alkyl cyanides undergo Stephen reduction to Produce

a. aldehyde

b. secondary a,lline

c. primary amine

d. amide

Problem06The continuous phase contains the dispersed phase throughout, example is

a. water in milk

b. fat in milk

c. water droplets in mist

d. coil in water

Problem07The number of hydrogen atoms present in 25.5 g or sucrose which

has a molar mass of 342.3 g is

a.

b.

c.

d.

12 22 11C H O

2322 x 10

239.91 x 10

2311 x 10

2344 x 10 H atoms

Problem08Milk changes afLer digestion into

a. cellulose

b. Fructose

c. glucose

d. lactose

Problem09Which of the follm,ing ser consists only of essential amino acids?

a. Alanine, tyrosine, cystine

b. Leucine, lysine, tryptophane

c. Alanine, glutamine, lycine

d. leucine, proline, glycine

Problem10Which of the following is a ketohexose?

a. Glucose

b. Sucrose

c. Fructose

d. Ribose

Problem11The oxidation, number of oxygen in is:

a. 3, 2

b. 1, 0

c. 0, 1

d. - 0.33. -1

3 2 2KO , Na O

Problem12Reaction of and PhMgBr would give

a. bromo benzene

b. chIorobenzene

c. triphenylphosphine

d. dichlorobenzene

3PCl

Problem13Which of the following is not a characteristic of transition elements?

a. Variable oxidation states

b. Formation of coloured compounds

c. Formation of interstitial compounds

d. Natural radioactivity

Problem14Cl – P – Cl bond angles in molecule are

a.

b.

c.

d.

5PCl

60 and 90

120 and 90

60 and 120

60 and 120

Problem15The magnetic moment of a salt containing ion is:

a. 0

b. 1.87

c. 5.92

d. 2

Problem16The number of formula units of calcium fluoride , present in 146.4 g

of (the molar mass of is 78.08 g/mol) is

a.

b.

c.

d.

2CaF

2CaF 2CaF

2421.146 x 10 CaF

2427.808 x 10 CaF

2421.129 x 10 CaF

2421.877 x 10 CaF

Problem17The IUPAC name of the given compound is:

a. penta amino cobalt chloride chlorate

b. c,obalt penta ammine chloro chloride

c. pentamine chIaro cobalt (III) chloride

d. penta amino cobalt (III) chlorate

3 25Co NH Cl Cl

Problem18When SCN- is added to an aqueous solution containing Fe(N03h, the ,complex ion

produced is

a.

b.

c.

d.

2

2 2Fe OH SCN

2

2 8Fe OH SCN

6

2Fe OH SCN

2

2 5Fe OH SCN

Problem19Hair dyes contain

a. copper nitrate

b. gold chloride

c. silver nitrate

d. copper sulphate

Problem20Schottky defects occurs mainly in eletrovalent compounds where

a. positive ions and negative ions are of different size

b. positive ions and negative ions are of same size

c. positive ions are small and negative ions are big

d. positive ions are big and negative ions are small

Problem21The number of unpaired electrons calculated in are

a. 4 and 4

b. 0 and 2

c. 2 and 4

d. 0 and 4

3 3

3 66Co NH and Co F

Problem22The standard free energy change of a reaction is

at 298 K. Calculate the equilibrium constant .

a. 20.16

b. 2.303

c. 2.016

d. 13.83

G 115 kJ

1 1p pK in log K R 8.314 Jk mol

Problem23If an endothermic reaction occurs spontaneously at constant temperature (T)

and pressure (p), then which of the following is true?

a.

b.

c.

d.

G 0

> 0

S < 0

S > 0

Problem24If a plot of versus t gives a straight line for a given reaction, then the

reaction is

a. zero order

b. first order

c. second order

d. third order

10log C

Problem25A spontaneous process is one in which the system suffers

a. no energy change

b. a lowering of free energy

c. a lowering of entropy

d. an increase in internal energy

Problem26The half-life period of a first order reaction is 1 min 40 s. Calculate its rate

constant.

a.

b.

c.

d.

3 16.93 x10 min

36.93 x 10 s

36.93 x 10 s

3 -16.93 x 10 s

Problem27The molar conductivities of KCl, NaCl and

respectively. What is the molar conductivity of ?

a.

b.

c.

d.

2 13KNO are 152, 128 and 111 S cm mol

3NaNO

2 1101 S cm mol

2 187 S cm mol

2 1 391 S cm mol

2 1101 S cm mol

Problem28The electrochemical cell stops working after sometime because

a. electrode potential of both the electrodes becomes zero

b. electrode potential of both the electrodes becomes equal

c. one of the electrodes is eaten away

d. the cell reaction gets reversed

Problem29The amount of electricity required to produce one mole of copper from copper

sulphate solution will be

a. 1 F

b. 2.33 F

c. 2 F

d. 1.33 F

Problem30Dipping iron article into a strongly alkaline solution of sodium phosphate

a. does not affect the article

b.

c. forms iron phosphate film

d. forms femc hydroxide

2 3 2forms Fe O .xH O on the surface

Problem31Hydroboration oxidation of 4-methyl octane would give

a. 4-methyloctanol

b. 2-methyl decane

c. 4-methyl heptanol

d. 4-methyl-2-octanone

Problem32When ethyl alcohol is heated with , the product obtained is

a.

b.

c.

d.

2 4conc. H SO

3 2 5CH COOC H

2 2C H

2 6C H

2 4C H

Problem33Anisole is the product obtained from phenol by the reaction known as

a. coupling

b. etherification

c. oxidation

d. esterification

Problem34Ethylene glycol gives oxalic acid on oxidation with

a.

b.

c.

d. periodic acid

2 2 7acidified K Cr O

4acidified KMnO

4alkaline KMnO

Problem35Diamond is hard because

a. all the four valence electrons are bonded to each carbon atoms by

covalent bonds

b. it is a giant molecule

c. it is made up of carbon atoms

d. it cannot be burnt

Problem36A Wittig reaction with an aldehyde gives

a. ketone compound

b. a long chain fatty acid

c. olefin compound

d. epoxide

Problem37Cannizaro reaction is given by‘

a. HCHO

b.

c.

d. 3 2CH CH OH

Problem38 Identify the reactant.

a.

b. HCHO

c. CO

d. 2H O

3CH CHO

Problem39Maleic acid and fumaric acid are

a. position isomers

b. geometric isomers

c. enantiomers

d. functional isomers

Problem40The gas evolved on heating alkali formate with soda-lime is

a. CO

b.

c. hydrogen

d. water vapour

2CO

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