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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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