vit - chemistry -2010 unsolved paper

VIT – PAST PAPERS

CHEMISTRY - UNSOLVED PAPER - 2010

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

01The correct formula of the complex tetraammineaquachlorocobalt (III) chloride

is

a.

b.

c.

d.

Problem

2 3 4Cl H O NH Co Cl

2 3 4CoCl H O NH Cl

3 24Co NH H O Cl Cl

2 3 24CoCl H O NH Cl

02The equivalent conductance at infinite dilution of a weak acid such as HF

a. can be determined by extrapolation of measurements on dilute solutions of

HCl, HBr and HI

b. can be determined by measurement on very dilute HF solutions

c. can best be determined from measurements on dilute solutions of NaF,NaCl

and HCl

d. is an undefined quantity

Problem

Problem03

The product 'A' is

a. succinic acid

b. melonic acid

c. oxalic acid

d. maleic acid

2

4

3

BrAlcoholic KCN 2 5 KOH CCl

H O

C H X Y Z

|

A

Problem04For a reaction of type , it is observed that doubling

concentration of A causes the reaction rate to be four times as great, but

doubling amount of B does not affect the rate. The unit of rate constant is

a.

b.

c.

d.

A B   products

1s

1 1s mol L

1 1s mol L

1 2 2s s mol L

Problem05A chemical reaction was carried out at 320 K and 300 K. The rate constants were

found to be

respectively. Then

a.

b.

c.

d.

1 2k and k

2 1k 4k

2 1k 2k

2 1k 0.25 k

2 1k 0.5 k

Problem06The formula of ethyl carbinol is

a.

b.

c.

d.

3CH OH

3 2CH CH OH

3 2 2CH CH CH OH

3 3CH COH

Problem07Which of the following gives red colour in Victor Meyer's test?

a. n-propyl alcohol

b. Isopropyl alcohol

c. tert-butyl alcohol

d. see-butyl alcohol

Problem08Enthalpy of a compound is equal to its

a. heat of combustion

b. heat of formation

c. heat of reaction

d. heat of solution

Problem09For which one of the following reactions will there be a positive 6.S?

a.

b.

c.

d.

2 2H O g  H O l

2 2H I  2HI

3 2CaCO s CaO s CO g

2 2 3N g 3H g 2NH g

Problem10Across the lanthanide series, the basicity of the lanthanide hydroxides

a. increases

b. decreases

c. first increases and then decreases

d. first decreases and then increases

Problem11When p-nitrobromobenzene reacts with sodium ethoxide, the product

obtained is

a. p-nitroanisole

b. ethyl phenyl ether

c. p-nitrophenetole

d. no reaction occurs

Problem12. A radioactive element X emits

Element X is

a.

b.

c.

d.

235763 , 1 and 1 particles and forms Y

24781X

24780X

246 81X

24680X

Problem13For the reaction, the equilibrium

constant, at 300 K is 16.0.The value of for

is

a. 8

b. 0.25

c. 0.125

d. 32

2 22A g B g 2AB g

pK pK 2 2AB g  A g 1 / 2B g

Problem14Frenkel defect is generally observed in

a. AgBr

b. AgI

c. ZnS

d. All of the above

Problem15Most crystals show good cleavage because their atoms, ions or molecules are

a. weakly bonded together

b. strongly bonded together

c. spherically symmetrical

d. arranged in planes

Problem16 exhibit which type of isomerism?

a. Geometrical

b. Optical

c. Linkage

d. Ionisation

3 2 2 3 24 4Co NH Cl NO and Co NH ClNO Cl

Problem17Which of the following compounds is not coloured?

a.

b.

c.

d.

2 4Na Cu Cl

4

Na Cd Cl

4 6K Fe CN

3 6K Fe CN

Problem18Which of the following is a Waterman aldehyde synthesis?

a.

b.

c.

d.

Problem19Aldol is

a.

b.

c.

d. None of the above

-hydroxybutyraldehyde

hydroxybutanal

hydroxypropanal

Problem20Nitrobenzene can be converted into azobenzene by reduction with

a.

b.

c. Zn/NaOH

d.

4Zn, NH Cl,

3Zn / NaOH, CH OH

4LiAlH , ether

Problem21The onewhich ideas' basic is

a.

b.

c.

d.

3NH

6 5 2C H NH

6 5 3C H N

6 5 2C H NH

Problem22Coordination number of Ni in is

a. 3

b. 6

c. 4

d. 5

4

2 4 3Ni C O

Problem23Mg is an important component of which biomolecule occurring extensively in

living world?

a. Haemoglobin

b. Chlorophyll

c. Florigen

d. ATP

Problem24Sterling silver is

a.

b.

c. Alloy of 80% Ag + 20% Cu

d. AgCl

3AgNO

2Ag S

Problem25Identify the statement which is not correct regarding

a. It reacts with KI to give iodine

b. It reacts with KCl to give

c. It reacts with NaOH and glucose to give

d. It gives CuO on strong heating in air

4CuSO

2 2Cu Cl

2Cu O

Problem26Transition metals usually exhibit highest oxidation states in their

a. chlorides

b. fluorides

c. bromides

d. iodides

Problem27The number of Faradays needed to reduce 4 g equivalents of to Cu metal will

be

a. 1

b. 2

c. 1/2

d. 4

2Cu

Problem28Which one of the following cells can convert chemical energy of H; and Oz

directly into electrical energy?

a. Mercury cell

b. Daniela cell

c. Fuel cell

d. Lead storage cell

Problem29On treatment of prop an one with dilute , the product formed is

a. aldol

b. Phorone

c. propionaldehyde

d. 4-hydroxy-4- methyl-2-pentanone

2

Ba OH

Problem30Which of the following converts ?

a. NaBr

b. NaOBr

c.

d. None of the above

3 2 3 2CH CONH to CH NH

2Br

Problem31Which metal, aprons are worn by radiographer to protect him from radiation?

a. Mercury coated apron

b. Lead apron

c. Copper apron

d. Aluminimised apron

Problem32The standard Gibb's free energy change, is related to equilibrium constant,

as

a.

b.

c.

d.

pK RT ln 1G

G

p

eK

RT

p

GK

RT

G /RTpK e

1G

pK

Problem33The yield of the product in the reaction would be

higher at

a. high temperature and high pressure

b. high temperature and low pressure

c. low temperature and high pressure

d. low temperature and low pressure

2A g 2B g  C g Q kJ

Problem34In which of the following case, does the reaction go farthest to completion?

a.

b. K = 10

c.

d. K=1

2K 10

-2K 10

Problem35Formation of cyanohydrin from a ketone is an example of

a. electrophilie addition

b. nucleophilic addition

c. nucleophilic substitution

d. electrophilic substitution

Problem36Glycerol on treatment with oxalic acid at forms

a. formic acid

b. allyl alcohol

c.

d. acrolein

2CO and CO

110 C

Problem37The activity of an old piece of wood is just 25% of the fresh piece of wood.

If of C-14 is 6000 yr, the age of piece of wood is

a. 6000 yr

b. 3000 yr

c. 9000 yr

d. 12000 yr

1/2t

Problem38The radius of is 95 pm and that of ion is 181 pm. Hence, the coordination

number of will be

a. 4

b. 6

c. 8

d. unpredictable

Na

Cl

Problem39The reaction , in the presence of , gives the following

product

a.

b.

c.

d.

2 2ROH H CN 4HBF

3ROCH

2RCH OH

2 2ROHCN N

2 3RCH CH

Problem40The fatty acid which shows reducing property is

a. acetic acid

b. Ethiopic acid

c. oxalic acid

d. Formic acid

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