Karnataka CET- 2012(Chemistry)

Question 1 of 58

1. Question

The mass of a non-volatile solute of molar mass 40 g mol^-1 that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is

10 g
11.4 g
9.8 g
12.8 g

Question 2 of 58

2. Question

During the adsorption of a gas on the surface of a solid, which of the following is True?

∆G < 0, ∆H > 0, ∆S< 0
∆G > 0, ∆H < 0, ∆S < 0
∆G < 0, ∆H < 0, ∆S < 0
∆G < 0, ∆H < 0, ∆S > 0

Question 3 of 58

3. Question

The approximate time duration in hours to electroplate 30g of calcium from molten calcium chloride using a current of 5 amp is (At.mass of Ca = 40)

8
80
10
16

Question 4 of 58

4. Question

The pH of the solution obtained by mixing 100 ml of a solution of pH = 3 with 400 ml of a solution of pH = 4 is

3 – log 2.8
7 – log 2.8
4 – log 2.8
5 – log 2.8

Question 5 of 58

5. Question

The equilibrium constant of the reaction :

A_(s) + 2B⁺_(aq) ⇌ A²⁺_(aq) + 2B_(s); E^o_cell = 0.0295 V is (2.303RT/F = 0.059)

10
2 × 10²
3 × 10²
2 × 10⁵

Question 6 of 58

6. Question

An oxygen containing organic compound was found to contain 52% carbon and 13% of hydrogen. Its vapour density is 23. The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is

Ethanol
Ethanal
Methoxy Methane
Methoxy Ethane

Question 7 of 58

7. Question

Which one of the following is NOT true regarding electromeric effect?

It results in the appearance of partial charges on the carbon atoms
It is a temporary effect
It operates on multiple bonds
It requires an attacking reagent

Question 8 of 58

8. Question

Which one of the following is NOT formed when a mixture of methyl bromide and bromobenzene is heated with sodium metal in the presence of dry Ether?

Ethane
Diphenyl
Propane
Toluene

Question 9 of 58

9. Question

Power alcohol is a mixture of

80% Petrol + 20% Benzene + small quantity of Ethanol
80% Petrol + 20% Ethanol + Small quantity of Benzene
80% Ethanol + 20% Benzene + Small quantity of Petrol
50% Petrol + 50% Ethanol + Small quantity of Benzene

Question 10 of 58

10. Question

20 ml of methane is completely burnt using 50 ml of oxygen. The volume of the gas left after cooling to room temperature is

80 ml
40 ml
60 ml
30 ml

Question 11 of 58

11. Question

100 ml of 0.1 M acetic acid is completely neutralized using a standard solution of NaOH. The volume of Ethane obtained at STP after the complete electrolysis of the resulting solution is

112 ml
56 ml
224 ml
560 ml

Question 12 of 58

12. Question

Saccharin, an artificial sweetener, is manufactured from

Cellulose
Toluene
Cyclohexane
Starch

Question 13 of 58

13. Question

Which of the following is NOT TRUE for S_N¹ reaction?

Favoured by polar solvents.
3^o – alkyl halides generally react through S_N¹ reaction
The rate of the reaction does not depend upon the molar concentration of the nucleophile
1^o – alkyl halides generally react through S_N¹ reaction

Question 14 of 58

14. Question

Oil of winter green is

An ester
A carboxylic acid
An alcohol
A ketone

Question 15 of 58

15. Question

An organic compound ‘A’ burns with a scooty flame. It is negative towards Tollen’s reagent test and positive for Borsche’s reagent test. The compound ‘A’ is

Benzaldehyde
Acetophenone
Acetone
Salicylic acid

Question 16 of 58

16. Question

For a reaction : A + B → Products, the rate of the reaction at various concentrations are given below :

Expt No	[A]	[B]	Rate (mol dm^-3 s^-1)
1	0.2	0.2	2
2	0.2	0.4	4
3	0.6	0.4	36

The rate law for the above reaction is

r = K[A]² [B]
r = K[A] [B]²
r = K[A]³ [B]
r = K[A]² [B]²

Question 17 of 58

17. Question

Which one of the following has NO unpaired electrons?

O₂
O₂^-
O₂⁺
O₂^--

Question 18 of 58

18. Question

The atomic number of cobalt is 27. The EAN of cobalt in Na₃[Co(NO₂)₄Cl₂] is

35
24
36
34

Question 19 of 58

19. Question

The “spin only” magnetic moment of Ni²⁺ in aqueous solution would be (At No. of Ni = 28)

√6 BM
√15 BM
√2 BM
√8 BM

Question 20 of 58

20. Question

Impossible orbital among the following is

2s
3f
2p
4d

Question 21 of 58

21. Question

The total number of electrons in 18 ml of water (density = 1 g ml^-1) is

6.02 × 10²³
6.02 × 10²⁵
6.02 × 10²⁴
6.02 × 18 × 10²³

Question 22 of 58

22. Question

The number of moles of hydrogen that can be added to 1 mole of an oil is the highest in

Linseed oil
Groundnut oil
Sunflower seed oil
Mustard oil

Question 23 of 58

23. Question

The reaction between sodium and water can be made less vigorous by

Lowering the temperature
Adding a little alcohol
Amalgamating sodium
Adding a little acetic acid

Question 24 of 58

24. Question

All colloidal dispersions have

Very high osmotic pressure
Low osmotic pressure
No osmotic pressure
High osmotic pressure

Question 25 of 58

25. Question

Silver iodide is used for producing artificial rain because AgI

is easy to spray at high altitude
is easy to synthesize
has crystal structure similar to ice
is insoluble in water

Question 26 of 58

26. Question

The equilibrium constant of a reaction is 0.008 at 298 K. The standard free energy change of the reaction at the same temperature is

+11.96 kJ
-11.96 kJ
-5.43 kJ
-8.46 kJ

Question 27 of 58

27. Question

The function of potassium ethyl xanthate in froth floatation process is to make the ore

Attracted towards water
Water repellant
Lighter
Heavier

Question 28 of 58

28. Question

The correct order of electro-negativities of N, O, F and P is

F > N > P > O
F > O > P > N
F > O > N > P
N > O > F > P

Question 29 of 58

29. Question

The s-block element used as a catalyst in the manufacture of Buna-S rubber is

Mg
Ca
Ba
Na

Question 30 of 58

30. Question

Which of the following is NOT a characteristic of a covalent compound?

Low melting point
No definite gerometry
Insoluble in polar solvent
Small difference in electro-negativity between the combining atoms

Question 31 of 58

31. Question

The volume of 0.1 M oxalic acid that can be completely oxidized by 20 ml of 0.025 M KmnO₄ solution is

125 ml
25 ml
12.5 ml
37.5 ml

Question 32 of 58

32. Question

A ligand is

Lewis acid
Bronsted acid
Either a Lewis acid or a Lewis base
Lewis base

Question 33 of 58

33. Question

The vapour pressures of two liquids A and B in their pure states are in the ratio of 1 : 2. A binary solution of A and B contains A and B in the mole proportion of 1 : 2. The mole fraction of A in the vapour phase of the solution will be

0.33
0.2
0.25
0.52

Question 34 of 58

34. Question

Which of the following statements is TRUE?

The total entropy of the universe remains constant.
The total entropy of the universe is continuously decreasing
The total energy of the universe is continuously decreasing
The total energy of the universe remains constant.

Question 35 of 58

35. Question

5 ml of 0.4 n NaOH is mixed with 20 ml of 0.1 N HCl. The pH of the resulting solution will be

6
7
8
5

Question 36 of 58

36. Question

On adding which of the following , the pH of 20 ml of 0.1 N HCl will not alter?

1 ml of 1 N HCl
20 ml of distilled water
1 ml of 0.1 N NaOH
500 ml of HCl of pH = 1

Question 37 of 58

37. Question

Which one of the following has a potential more than zero?

Pt, ½ H₂ (1 atm) ǀ HCl (1 M)
Pt, ½ H₂ (1 atm) ǀ HCl (2 M)
Pt, ½ H₂ (1 atm) ǀ HCl (0.1 M)
Pt, ½ H₂ (1 atm) ǀ HCl (0.5 M)

Question 38 of 58

38. Question

HCHO was treated with a reagent X. The product formed upon hydrolysis in the presence of an acid gave C₂H₅ The reagent X is

Aqueous KOH
Alcoholic KOH
Alcoholic KCN
CH₃ MgI

Question 39 of 58

39. Question

Benzylamine is a stronger base than aniline because

The lone pair of electrons on the nitrogen atom in benzylamine is delocalised
The lone pair of electrons on the nitrogen atom in aniline is delocalised
The lone pair of electrons on the nitrogen atom in aniline is not involved in resonance
Benzylamine has a higher molecular mass than aniline.

Question 40 of 58

40. Question

The relative acidic strengths of benzoic acid, o-toluic acid and p-toluic acid of the decreasing order :

p-toluic acid > o-toluic acid > benzoic acid
o-toluic acid > p-toluic acid > benzoic acid
p-toluic acid > benzoic acid > o-toluic acid
o-toluic acid > benzoic acid > p-toluic acid

Question 41 of 58

41. Question

The C – H bond and C – C bond in ethane are formed by which of the following types of overlap?

sp³ – s and sp³ – sp³
sp² – s and sp² – sp²
sp – s and sp – sp
p – s and p – p

Question 42 of 58

42. Question

A first order reaction is 60% complete in 20 minutes. How long will the reaction take to be 84% complete?

54 mins
68 mins
40 mins
76 mins

Question 43 of 58

43. Question

A given sample of milk turns sour at room temperature (27 ^oC) in 5 hours. In a refrigerator at -3 ^oC, it can be stored 10 times longer. The energy of activation for the souring of milk is

2.303 × 10 R kJ . mol^-1
2.303 × 5 R kJ . mol^-1
2.303 × 3 R kJ . mol^-1
2.303 × 2.7 R kJ . mol^-1

Question 44 of 58

44. Question

At 300 K, a gaseous reaction :

A → B + C

was found to follow first order kinetics. Starting with pure A, the total pressure at the end of 20 minutes was 100 mm of Hg. The total pressure after the completion of the reaction is 180 mm of Hg. The partial pressure of A (in mm of Hg) is

100
90
180
80

Question 45 of 58

45. Question

From the Ellingham graphs on Carbon, which of the following statements is FALSE?

CO₂ is more stable than CO at less than 983 K
CO reduces Fe₂O₃ to Fe at less than 983 K
CO is less stable than CO₂ at more than 983 K
CO reduces Fe₂O₃ to Fe in the reduction zone of Blast furnace

Question 46 of 58

46. Question

Which of the following is negatively charged bidentate ligand?

Bimethyl gyyoximato
Cyano
Ethylene diamine
Acetato

Question 47 of 58

47. Question

The secondary valency of platinum in tetra ammine dichoroplatinum (IV) chloride is

+4
+2
3
6

Question 48 of 58

48. Question

Which one of the following has a magnetic moment of 1.75 BM?

Ti³⁺
V³⁺
Cr³⁺
Fe³⁺

Question 49 of 58

49. Question

The correct order of ionization energy of C, N, O and F is

F < N < C < O
C < N < O < F
C < O < N < F
F < O < N < C

Question 50 of 58

50. Question

The correct set of four quantum numbers for the outermost electron of sodium (Z = 11) is

3, 1, 0, ½
3, 1, 1, ½
3, 2, 1, ½
3, 0, 0, ½

Question 51 of 58

51. Question

The ore that is concentrated by the Froth Floatation process is

Chalcopyrites
Cryolite
Cuprite
Calamine

Question 52 of 58

52. Question

The equivalent mass of a certain bivalent metal is 20. The molecular mass of its anhydrous chloride is

91
111
55.5
75.5

Question 53 of 58

53. Question

2 moles of N₂O_4(g) is kept in a closed container at 298 K and under 1 atm pressure. It is heated to 596 K when 20% by mass of N₂O_4(g) decomposes to NO₂. The resulting pressure is

2.4 atm
1.2 atm
4.8 atm
2.8 atm

Question 54 of 58

54. Question

Sucrose is NOT a reducing sugar

It is chemically stable
It contains no free aldehyde or keto group adjacent to a – CHOH group
It is built up of a fructose unit
It is optically active

Question 55 of 58

55. Question

Which one of the following contains ionic, covalent and co-ordinate bonds?

NaOH
NaCl
NaCN
NaNC

Question 56 of 58

56. Question

Dialysis can be used to separate

Glucose and fructose
Protein and starch
Glucose and protein
Glucose and NaCl

Question 57 of 58

57. Question

The percentage of p-character of the hybrid orbitals in graphite and diamond are respectively :

33 and 25
50 and 75
67 and 75
33 and 75

Question 58 of 58

58. Question

A gas expands from a volume of 1 m³ to a volume of 2 m³ against an external pressure of 10⁵ Nm^-2. The work done by the gas will be

10⁵ kJ
10² kJ
10² J
10³ J

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