Chemistry

Single correct answer type:

1. Given that the reduced temperature,

the reduced pressure,

the reduced

volume,

Thus, it can be said that the reduced equation of state may be given as

(A) (

) ( )

(B) (

) ( )

(C) (

) ( )

(D) (

) ( )

Solution: (D)

(

)

( )

(

)

Thus, substituting in the van der Waals’ equation,

(

) ( )

Or (

) ( )

This is reduced state equation

Or, (

) ( )

2. The suitable reaction steps to carry out the following transformation is

(A)

(B)

(C)

(D)

Solution: (C)

3. →

Here, is

(A) (B) Colloidal sulphur

(C) Gaseous sulphur (D) Solid sulphur

Solution: (B)

4. For preparing 3.00 L of 1M by mixing portions of two stock solutions (A and B)

of 2.50 M and 0.40 M respectively. Find out the amount of B stock solution

(in L) added.

(A) 8.57 L (B) 2.14 L (C) 1.28 L (D) 7.51 L

Solution: (B)

Moles needed = (300 L) (100 M) = 3 mol. Suppose that of 2.50 M added, then

( ) of 0.40 M NaOH added. The number of moles of solute from the more

concentrated solution is 2.50, that become less concentrated solution is (0.40) (

)

The total number of moles is 3.00.

( ) ( )( )

Or

Or

Or

( )

5. Sodium sulphite is used in preserving squashes and other mildly acidic foods due to

(A) Potassium salt has preservative action

(B) Potassium metabisulphite prevents oxidation

(C) Potassium metabisulphite is not influcenced by acid

(D) Sulphur dioxide and sulphurous acid formed kill bacteria and germs

Solution: (D)

and sulphurous acid ( ) kill the bacteria and prevent the decay of food.

6. The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of

1,368 kHz (Kilohertz). Calculate the wavelength ( ) of the electromagnetic radiation

emitted by transmitter. Which part of the electromagnetic spectrum does it belong to

(A) 319.4m and X-rays

(B) 319.4m and radowave

(C) 219.3m and microwave

(D) 219.3m and radiowave

Solution: (D)

⁄

The range of wavelength of radiowaves is 100m to radiation is 1000m.

7. Which of the following soap/detergent is least, reduce space biodegradable?

(A) ( )

(B)

(C)

(D)

Solution: (C)

Alkyl benzenesulphonates derived from branch chain alkanes have much lower

biodegradability.

8. In an atom, an electron is moving with a speed of 600 m/s with an accuracy of

0.005%. Certainty with which the position of the electron can be located is

(Given, mass of electron )

(A) (B)

(C) (D)

Solution: (C)

Given that velocity of electron, ⁄

Accuracy of velocity

According to Heisenberg’s uncertainty principle

Or,

9. Buna-N, a synthetic rubber is copolymer of

Buna-N is a copolymer of butadiene and acrylonitrile.

10. What would be the heat released when an aqueous solution containing 0.5 mole of

is mixed with 0.3 mole of ?

(enthalpy of neutralization is )

(A) 28.5 kJ (B) 17.1kJ (C) 45.7 kJ (D) 1.7 kJ

Solution: (B)

mole of equivalents to mole of . But only 0.3 mole of ions are

available. Thus, 0.3 mole of ions will combine with 0.3 mole of ions to form 0.3

mole of and 0.2 mole of

Ions will remain unreacted. Heat evolved when 1 mole of ions combine with 1 mole

of ions . Therefore, heat evolved where 0.3 mole of ions combine with

0.3 mole of ions

11. The number average molar mass and mass average molar mass of a polymer are

respectively 30,000 and 40,000. The polydispersity index (PDI) of the polymer is

(A) (B) (C) (D)

Solution: (C)

Polydispersity index (PDI)

12. The charge/size ratio of a cation determines its polarizing power. Which one of the

following sequences represents the increasing order of the polarizing power of the

cationic species,

(A)

(B)

(C)

(D)

Solution: (A)

High charge and small size of the cations increases polarization.

As the size of the given cations decreases as

Thus, polarizing power increases as

13. In an amino acid, the carboxyl group ionizes at and ammonium ion at

The isoelectric point of the amino acid is at pH

(A) 4.32 (B) 3.34 (C) 9.46 (D) 5.97

Solution: (D)

Isoelectric point,

14. of helium in a bulb at a temperature of had a pressure of p atm. When the

bulb was immersed in water bath at temperature 50 K more than the first one, 0.08g of

gas had to be removed to restore the original pressure. T is

(A) 500 K (B) 400 K (C) 600 K (D) 200 K

Solution: (D)

As pressure and volume remains constant,

( )

On putting the values,

( )

Or

Or

15. What percentage of -D-(+)-glucopyranose is found at equilibrium in the aqueous

solution?

(A) 64% (B) 36% (C) 100% (D) 50%

Solution: (A)

Ordinary glucose is - glucose, with a fresh aqueous solution has specific rotation,

[ ] . On keeping the solution for sometimes, -glucose slowly changes into

an equilibrium mixture of -glucose (36%) and -glucose (64%) and the mixture has

specific rotation .

16. Which of the following is correctly arranged in order of increasing weight?

(A) equivalent of of atom

atoms of

(B) of equivalent of atoms of

atom of

(C) of atoms of atom of equivalent of

(D) equivalent of atom of atoms of

of

Solution: (C)

( )

atoms of

atoms of

Increasing order of weight

17. The correct order of basic strength of the following are

(A) (B)

(C) (D)

Solution: (D)

Electron releasing groups increase the basic strength of amines while electron

withdrawing groups decreases. Thus, the orders is

as in group is hanked by two electron withdrawing

groups.

18. If for a given substance, melting point is and freezing points is then correct

variation of entropy by graph between entropy change and temperature is

(A)

(B)

(C)

(D)

Solution: (B)

For a pure substance and are same. Above to this temperature, entropy will

increase and below this temperature entropy remains constant.

19. When a mixture of 1-hexanol and hexanoic acid in diethyl ether is shaken with an

aqueous solution, then which of the following is right distribution?

(A)

(B)

(C)

(D)

Solution: (C)

Hexanoic acid is soluble in ether whereas alcohol is not soluble in solution.

20. and for the reaction,

( ) ( )

( ) are 30.56 kJ and respectively.

The temperature at which the free energy change for the reaction will be zero, is

(A) 3528 K (B) 463 K (C) 73 K (D) 144 K

Solution: (B)

From the Gibb’s – Helmholtz equation,

At equilibrium,

Hence, or,

Or,

Given that,

21.

The major product P will ne

(A)

(B)

(C)

(D)

Solution: (C)

22. If ( )

Then, for [ ( ) ] equilibrium constant will be

(A) (B)

(C) (D)

Solution: (C)

For the given reaction,

( )

Hence for

Now for the reaction,

[ ( ) ]

23. What is product of the following sequence of reactions?

(A)

(B)

(C)

(D)

Solution: (D)

24. For the following equilibrium (omitting charges)

I.

II.

III.

IV.

then relationship between and is

(A)

(B)

(C)

(D) All of the above

Solution: (D)

On adding I, II and III, we get IV

Or,

Or

(where, )

25. can be converted into by the following

sequence of steps.

(A) ⁄ (B)

(C) (D)

Solution: (B)

26. When acts as an oxidizing agent and ultimately forms

and then the number of electrons transferred in each case respectively are

(A) (B) (C) (D)

Solution: (A)

27. The product P of the given reaction is

(A)

(B)

(C)

(D)

Solution: (D)

Oxymercuration – demercuration of alkenes leads to hydration according to

Markownikoff’s rule.

Hence,

28. In acidic medium, dichromatic ion oxidises ferrous ion to ‘ferric ion. If the gram

molecular weight of potassium dichromate is294g, its gram equivalent weight (in grams)

is

(A) 24.5 (B) 49 (C) 125 (D) 250

Solution: (B)

In acidic medium, acts as strong oxidizing agent and itself gets reduced to

Equivalent weight of

29. Find out the correct stereoisomeric product for the following reaction,

(A) d-form (B) l-form

(C) meso-form (D) racemic mixture

Solution: (D)

Bridged ion attacked by ion form trans product.

Therefore, cis-2-butene on addition of forms d-and l-forms in 1 : 1 equivalent

amount resulting in the formation of racemic mixture.

30. Ferrous oxide has a cubic structure. The length of edge of the unit cell is and the

density of the oxide is . Then the number of and ions present in

each unit cell will be

(A) Four and two

(B) Four and four

(C) Two and four

(D) Two and two

Solution: (B)

As

( )

Molecular mass,

( )

Four molecules of ferrous oxide, FeO per unit cell, it means that and ions

are present in each unit cell.

31. In the reaction ⁄→

⁄→

⁄→ Z is

(A) o-bromotoluene

(B) p-bromotoluene

(C) 3-bromo-2, 2, 6-trichlorotoluene

Solution: (B)

32. Which of the following arrangements correctly represents hexagonal and cubic close

packed structure respectively?

(A)

(B)

(C) Both have arrangement

(D) Both have arrangement

Solution: (A)

In hexagonal close packed (hcp) structure, each sphere of third layer lies exactly above

the sphere of first layer. Hence, hcp is abbreviated as ABABAB………

In cubic close packed (ccp) structure, the spheres of third layer do not come over those

of first, layer and sphere of fourth layer correspond with those in first layer. Hence, it can

be shown as ABC ABC……. .

33. mole of [ ( ) ( ) ( )] was passed through a cation exchanger and

the acid coming out of it required 20 mL of 0.1M for neutralization. Thus, the

complex is

(A) [ ( ) ( )]

(B) [ ( ) ( )]

(C) [ ( ) ]

(D) None of the above

Solution: (A)

Millimoles of acid required for neutralization

millimoles

moles

If 0.001 mole is neutralizing 0.002 moles of base, thus, 0.001 moles of base remains

unreacted. Hence, acid coming out should be basic.

[ ( ) ( )] [ ( ) ( )]

34. The molal freeing point depression constant for benzene ( ) is 4.90K Kg .

Selenium exists as a polymer of the type . When 3.26g of selenium is dissolved in

226g of benzene, the observed freezing point is lower than that of pure

benzene. The molecular formula of selenium is

(atomic mass of Se = 78.8g )

(A) (B) (C) (D)

Solution: (A)

To calculate the molar mass of selenium (Se)

Mass of selenium ( )

Mass of benzene ( )

Depression in freezing point ( )

Molar depression constant ( )

( ) ( )

( ) ( )

Given, gram atomic mass of selenium

⁄

For ( )

Or,

Thus, molecular formula of selenium .

35. In the complexes [ ( ) ] [ ( ) ]

[ ( ) ] [ ]

more

stability is shown by

(A) [ ] (B) [ ( ) ]

(C) [ ( ) ] (D) [ ( ) ]

Solution: (B)

More basic and chelate forming ligand stabilizes the complex to more extent is a

bidentate chelating ligand thus stabilizes the complex [ ( ) ] to a high extent.

36. For an ideal binary liquid solution with

in which relation between (mole

fraction of in liquid phase) and (mole fraction of in vapour phase) is correct,

and are mole fraction of in liquid and vapour phase respectively

(A) (B)

(C)

(D) and cannot be correlated

Solution: (C)

Therefore,

37. Point out the incorrect reaction from the following.

(A)

(B)

(C)

(D)

Solution: (B)

Pyrolusite ore, on fusion with KOH in presence of air forms potassium manganite,

38.

respectively are

(A)

(B)

(C)

(D)

Solution: (A)

39. A student made the following observations in the laboratory.

I. Clean copper metal did not react with 1molar ( ) solution

II. Clean lead metal dissolved in a 1 molar solution and crystals of metal

appeared

III. Clean silver metal did not react with 1 molar ( ) solution

The order of decrease in reducing character of three metals is

(A) (B) (C) (D)

Solution: (A)

Metal placed above in electrochemical series replaces the other from its salt solution

which is lower in the series.

The low value containing metals have the high reducing character.

Thus, order of reducing character of three metals is

40. Choose the correct alkyne and reagents for the preparation of

(A)

(B)

(C)

(D)

Solution: (A)

41. The conductivity of acetic acid is Find out its

dissociation constant if for acetic acid is

(A) (B)

(C) (D)

Solution: (B)

( ) ( )

( )

42. In order to prepare one litre 1N solution of how many grams of are

required, if the solution to be used in acid medium for oxidation?

(A) 128 g (B) 41.75 g (C) 31.60 g (D) 62.34 g

Solution: (C)

In acidic medium,

(From )

Hence, equivalent weight of in acidic

Medium

solution can be prepared by dissolving 31.6g in 1L solution.

43. Which of the following represents the correct order of decreasing number of

bonds?

(A)

(B)

(C)

(D)

Solution: (C)

44. A hypothetical reaction,

follows the following mechanism

……..fast

……slow

…….fast

The order of the overall reaction is

(A) (B)

(C) (D)

Solution: (B)

Rate [ ] [ ]

But, [ ]

[ ] [ ] √ [ ]

Rate √ √[ ] [ ] [ ]

[ ]

Thus, order,

45. The major role of fluorspar ( ) which is added in small quantity in the electrolytic

reduction of alumina dissolved in fused cryolite ( ) is

I. As a catalyst.

II. To make the fused mixture very conducting.

III. To lower the temperature of melting.

IV. To decrease the rate of oxidation of carbon at the anode.

(A) I, II (B) II, III (C) I, II, III (D) III, IV

Solution: (B)

Fluorspar is added in small quantity in the electrolytic reduction of alumina dissolved in

fused cryolite ( ) to make the fused mixture more conducting and to lower the

melting point of fused mixture at 1140K.

46. The variation of concentration of the product P with time in the reaction, is

shown in following graph.

The graph between [ ]

and time will be of the type

(A)

(B)

(C)

(D)

Solution: (A)

Concentration of the product increases linearly with time t, thus order = 0 and [ ]

constant.

47. Point out the correct statement.

(A) Below is better reducing agent than CO

(B) Below is better reducing agent than C

(C) Below is an oxidizing agent

(D) Below is a reducing agent

Solution: (B)

48. Which of the following represents physical adsorption?

(A)

(B)

(C)

(D)

Solution: (D)

The physical adsorption isobar shows a decrease in ⁄ throughout with rise in

temperature.

Ideal Time:

49. reacts with ferrous sulphate according to the following equation,

Here, 10mL of 0.1M is equivalent to

(A) 50 mL of 0.1

(B) 20 mL of

(C) 40 mL of

(D) 30 mL of

Solution: (A)

For the reaction,

5 times quantity of consumed than .

Thus, 10 mL of 0.1 is equivalent to 50 mL of 0.1 M

50. In an experiment, addition of 4.0 mL of 0.005M to 16.0 mL of arsenious

sulphide sol just causes complete coagulation in 2h. The flocculating value of the

effective ion is

(A) (B)

(C) (D)

Solution: (A)

sol is negatively charged owing to preferential adsorption of ions. Cation

would be effective in causing coagulation.

Flocculating value = minimum millimole of the effective ion per litre of sol

( )

51. Which of the following atomic and physical properties of hydrogen is false?

(A) Hydrogen > Deuterium > Tritium; (melting point/K)

(B) Hydrogen < Deuterium < Tritium; (boiling point/K)

(C) Hydrogen < Deuterium < Tritium; (density/ )

(D) Hydrogen > Deuterium > Tritium; (% relative abundance)

Solution: (A)

Melting point (K) 20.62 > 18.5 > 13.9

Boiling point (K) 24.9 > 23.5 > 20.4

Density (g/L) 0.27 > 0.18 > 0.09

Relative abundance (%) < 0.016 < 99.984

52. Eutrophication of a lake means, it

(A) Is low is nutrients

(B) Is high in nutrients

(C) Has a high temperature

(D) Has excess amount of organic matter

Solution: (B)

Eutrophication means high concentration of phosphates and nitrates from fertilser and

detergents in aquatic ecosystems.

53. When is added to ice cold solution of acidified potassium dichromate in ether

and the contents are shaken and allowed to stand

(A) A blue colour is obtained in ether because of formation of

(B) A blue colour is obtained in ether because of formation of

(C) A blue colour is obtained in ether because of formation of ( )

(D) Chromyl chloride is formed

Solution: (A)

When is added to acidified potassium dichromate in ether solution, potassium

dichromate is oxidized to blue peroxide of chromium ( ) which is soluble in ether

and produces blue coloured solution.

54. 500 mL of a sample of water required 19.6 mg of for the oxidation of

dissolved organic matter in it in the presence of The COD of water sample is

(A) 3.2 ppm (B) 7.2 ppm (C) 6.4 ppm (D) 4.6 ppm

Solution: (C)

55.

The chemical formulae of and are

(A) ( )

(B)

(C)

( )

(D)

( )

Solution: (D)

56. For carbanion

Stability order will be

(A) (B)

(C) (D)

Solution: (B)

As-M and –I-effect increase, stability of carbanion increases. – M -effect is possible only

at ortho and para-position and –I-effect is more pronounced at ortho position.

Hence, correct order of stability is

57. The aqueous solution of an unknown sodium salt gives the following reactions.

I. It decolourises a solution of iodine in potassium iodide.

II. It gives white turbidity with dil. solution.

III. It gives a white precipitate with solution which changes colours and finally

becomes black on standing.

The unknown sodium salt is

(A) Sodium thiosulphate

(B) Sodium bisulphte

(C) Sodium sulphite

(D) Sodium sulphide

Solution: (A)

I.

II.

III.

58. The catenation tendency of C, Si and Ge is in the order The bond

energies ( ) of and bonds, respectively are

(A) 348, 167, 180 (B) 348, 180, 167

(C) 167, 180, 348 (D) 180, 167, 348

Solution: (B)

Catenation tendency decreases with the decrease in M – M bond energy. Thus, bond

energies of and must be 348, 180 and 167 kJ respectively.

59. What is correct about the following structure?

(A) Total stereoisomers = 4

(B) Number of chiral carbons = 1

(C) Number of optical isomers = 2

(D) Number of meso compounds = 2

Solution: (C)

Optical isomers = 2

Total stereoisomers = 3

60. Number of oxygen atoms shared per tetrahedron in

I. Two dimensional sheet structured silicates

II. Cyclic silicates and

III. Single strand chain silicates respectively are

(A) 3, 3, 2 (B) 2, 2, 2 (C) 4, 3, 1 (D) 4, 3, 2

Solution: (B)

In two dimensional sheet silicates, three oxygens of each units are shared.

Hence, it contain ( ) type anions. Cyclic silicates are obtained by sharing of two

oxygen atoms of each tetrahedron. Chain silicates are also formed by the sharing

of two oxygen atoms of each units.