VIT – PAST PAPERS

CHEMISTRY - UNSOLVED PAPER - 2007

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

01An ion leaves its regular site occupy a position in the space between the lattice

sites is called:

a. Frenkel defect

b. Schottky defect

c. impurity defect

d. vacancy defect.

Problem

02The 8 : 8 type of packing is present in :

a. MgF2

b. CsCl

c. KCl

d. NaCl

Problem

Problem03When a solid melts reversibly:

a. H decreases

b. G increases

c. E decreases

d. S increases

Problem04Enthalpy is equal to :

a.

b.

c.

d.

2

P

G/ TT

T

2

P

G/ TT

T

2

V

G/ TT

T

2

V

G/ TT

T

Problem05Condition for spontaneity' in an isothermal process is :

a.

b.

c.

d.

A W 0

G U 0

A U > 0

G - U 0

Problem06Given:

The heat of formation of acetylene is:

a. -1802 kJ

b. +1802 kJ

c. +237 kJ

d. -800 kJ

2 22C 2O g 2CO g ; 787 k J

2 2 2

1H g O g 2H O l ; 286 k J

2

2 2 2 2 2

1C H g 2 O g 2CO g H O l ; 1310 k J

2

Problem07given the equilibrium system:

What change will shift the equilibrium to the right?

a. Decreasing the temperature

b. Increasing the temperature

c. Dissolving NaCl crystals in the equilibrium mixture

d. Dissolving crystals in the equilibrium mixture

4 4NH Cl s NH aq Cl aq =+3.5kcal/mol

Problem08According to Arrhenius equation, the rate constant (k) is related to

temperature (T) as :

a.

b.

c.

d.

a2

1 1 2

Ek 1 1ln

k R T T

a2

1 1 2

Ek 1 1ln

k R T T

a2

1 1 2

Ek 1 1ln

k R T T

a2

1 1 2

Ek 1 1ln

k R T T

Problem09Equivalent amounts of are heated in a closed vessel till equilibrium is obtained.

If 80% of the hydrogen can be converted to HI, the at this temperature is :

a. 64

b. 16

c. 0.25

d. 4

Problem10For the reaction

,

the equilibrium constant KP changes with:

a. total pressure

b. catalyst

c. The amount H2 and I2

d. temperature

2 2H g I g   2HI g

Problem11How long (in hours) must a current of 5.0 A be maintained to electroplate 60 g

of calcium from molten ?

a. 27 h

b. 8.3 h

c. 11 h

d. 16 h

Problem12For strong electrolytes the plot of molar conductance vs is :

a. parabolic

b. linear

c. sinusoidal

d. circular

C

Problem13If the molar conductance values of at infinite dilution are

respectively and

then that of is :

a.

b.

c.

d.

2Ca and Cl

4 2 -1118.88 x 10 m mho mol 4 2 177.33 x 10 m mho mol

2CaCl

4118.88 x 10

4154.66 x 10

4273.54x 10

4196.21x 10

Problem14The standard reduction potentials at 298 K for the following half reactions are

given against each :

The strongest reducing agent is:

a. Zn(s)

b. Cr(s)

c.

d.

2 oZn aq 2e  Zn s  E 0.762 V

3 oCr aq 3e Cr s E 0.740 V

o22H aq 2e H g E 0.00 V

3 2 oFe aq 3e Fe aq E 0.762 V

2H g

2Fe aq

Problem15The epoxide ling consists of which of the following :

a. three membered ring with two carbon and one oxygen

b. four membered ring with three carbon and one oxygen

c. five membered ling with four carbon and one oxygen

d. six membered ling with five carbon and one oxygen

Problem16In the Grignard reaction, which metal forms an organometallic bond?

a. Soldiery

b. Titanium

c. Magnesium

d. Palladium

Problem17Phenol is more acidic than :

a. p-chlorophenol

b. p-nitrophenol

c. o-nitrophenol

d. ethanol

Problem18Aldol condensation is given by:

a. tIimethylacetaldehyde

b. acetaldehyde

c. benzaldehyde

d. formaldehyde

Problem19Give the IUPAC name for

a. etnyl-4-oxoheptanoate

b. methyl-4-oxoheptanoate

c. ethyl-4-oxohexanoate

d. methyl-4-oxohexanoate

3 2 2 2 3

O O

|| ||

H C CH C H C-CH C OCH

Problem20In which of the below reaction do we find ,a,

undergoing a ling closure reaction with conjugated dienes?

a. Perkin reaction

b. Diels-Alder reaction

c. Claisen rearrangement

d. Hofmann reaction

unsaturated carbonyl compounds

Problem21The catalyst used in Rosenmund reaction is :

a. Zn/Hg

b.

c. Raney Ni

d. Na in ethanol

4Pd / BaSO

Problem22 ?

a.

b.

c. RCOOR

d. RCOOH

2H O2 2

CH CO O RMgX  

2ROOC CH COOR

2ROOC CH COOR

Problem23Identify, which of the below does not possess any element of symmetry?

a. (+)(-) tariaricacid

b. Carbon tetrachloride

c. Methane

d. Meso-tartaric acid

Problem24The weakest acid amongst the following is :

a.

b. HCOOH

c.

d.

2ClCH COOH

2ClCH COOH

2CH l COOH

Problem25Urea on slow, heating gives:

a.

b.

c. HCNO

d.

2 2NH CONHNO

2 2NH CONHCONH

2 2 3NH CONH . HNO

Problem26Trans esterification is the process of :

a. conversion of an aliphatic acid to ester

b. conversion of an aromatic acid to ester

c. conversion of one ester to another ester

d. conversion of an ester into its

Problem27Components namely acid and alcohol The correct sequence of base strengths in

aqueous solution is :

a.

b.

c.

d.

3 3 2 32 3CH NH CH NH CH N

3 3 3 22CH N CH NH CH NH

3 3 2 33 2CH N CH NH CH NH

3 3 3 22 2CH NH CH N CH NH

Problem28When aqueous solution of benzene diazoniumchloride is boiled, the product

formed is :

a.

b.

c.

d.

6 5 2C H CH OH

6 6 2C H N

6 5C H COOH

6 5C H COOH

Problem29Carbylamines reaction is given by aliphatic:

a. primary amine

b. secondary amine

c. tertiary amine

d. quaternary ammonium salt

Problem30 ?

a.

b.

c.

d.

3NH6 5C H CHO

6 5 6 52C H CHN CH.C H

6 5 3C H NHCH

6 5 2 2C H CH NH

6 5 6 5C H NHC H

Problem31In , the central atom tellurium involves:

a.

b.

c.

d.

4TeCl

3sp hybridisation3sp d hybridisation

3sp d hybridisation3sp d hybridisation

Problem32Which of the following compounds volatilises on heating?

a.

b.

c.

d.

2MgCl

2HgCl

2CaCl

3FeCl

Problem33A nuclear reaction of with a neutron produces and two

neutrons. Other element produced in this reaction is :

a.

b.

c.

d.

23592 U 90

36Kr

13752 Te

14455 Cs

13756 Ba

14456 Ba

Problem34AgCI dissolves in a solution of but not in water because :

a.

b.

c.

d.

3NH

3 2NH is a better solvent than H O

3 2NH is a better solvent than H O

3 2NH is a stronger base than H O

3the dipole moment of water is higher than NH

Problem35Which of the following is hexadentate ligand?

a. Ethylene diamine

b. Ethylene diamine tetra acetic acid

c. 1, 10-phenanthroline

d. Acetyl acetonato

Problem36A coordiante bond is a dative covalent bond, Which of the below is true?

a. Three atom form bond by sharing their electrons

b. Two atom form bond by sharing their electrons

c. Two atoms form bond and one of them provides both electrons

d. Two atoms form bond by,sharing electrons obtained from third atom

Problem37Which of the following complex has zero magnetic ~oment (spin only)?

a.

b.

c.

d.

3 26Ni NH Cl

3 6Na FeF

4 6K Fe CN

2 46Cr H O SO

Problem38The IUPAC name of is :

a. bis dichloro (triphenylphosphine) nickel

b. dichloro bis (triphenylphosphine) nickel

c. dichloro triphenylphosphine nickel (II)

d. triphenyl phosphine nickel (II) dichloride

2

3 22Ni PPh Cl

Problem39Among the following the compound that is both paramagnetic and coloured is

:

a.

b.

c.

d.

2 2 7K Cr O

4 62NH TiCl

4VOSO

3 4K Cu CN

Problem40On an X-ray diffractipn photograph the intensity of the spots depends on:

a. neutron density of the atoms/ions

b. electron density of the atoms/ions

c. proton density of the atoms/ions

d. photon density of the atoms/ions

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