2022Flame Institute

55. 35. 4 mL of HCl is required for the neuralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is

a. o.97 N b. 0.142 N c. 0.194 N d. 0.244 N Ans. c (12)

54. 20mL of 10 NHCl are mixed with 10 mL of 36

N H2 SO4 and the mixture is made one litre. Normality of the mixture will be a. 0.56 N b. 0.50 N c. 0.40 N d. 0.35 N Ans. b (6)

52. 10mL of conc.

H2 SO4 (18 molar) is diluted to 1 litre. The approximate strength of dilute acid could be a. 0.18 N b. 0.09 N c. 0.36 N d. 1800 N Ans. c (12)

53. The weight of sodium carbonate required to prepare 500 mL of a semi- normal solution is

a. 13. 25 g b. 26. 5 g c. 53 g d. 6.125 g Ans. a (10)

51. On dissolving 1 mole of each of the following acids in 1 litre water, the acid which does not give a solution of strength 1N is

a. HCl b. perchloric acid c. HNO3 d. phosphoric acid Ans. d (10)

50. To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid the volume of 0.1 M aqueous KOH solution required is

a. 40 mL b. 20mL c. 10mL d. 60 mL Ans. a (8)

49. Normality of 2M sulphuric acid is

a. 2N b.4N c. N/2 d. N/4 Ans. b Explanation : N = M x basicity ; N = 2 x 2 = 4 (14)

47. Two solutions of HCl, A and B have concerntrations of 0.5 and 0.1 M respectively. The volume of solutions A and B required to make 2 litres of 0.2 N HCl are

a. 0. 5 L of A + 1.5 L of B b. 1.5 L of A + 0.5 L of B c. 1.0 L of A + 1.0 L of B d. 0. 75 L of A + 1.25 L …

48. A solution contains

1.2046 x 106 hydrochloric acid molecules in one dm3 of the solution . The strength of the solution is a. 6 N b. 2N c. 4N d. 8 N Ans. b (13)

46. Volume of water needed to mix with 10 mL

10N HNO3 to get 0.1 N HNO3 a. 1000 mL b. 990 mL c. 1010 mL d. 10 mL Ans. b Explanation : N1 V1 = N2 V2 10 x 10 = 0.1 (10+V) V = 10 x 10 / …

45. The volume of water to be added to

100 cm3 of 0.5 N H2 SO4 to get decinormal concentration is a. 400 cm3 b. 500cm3 c. 450 cm3 d. 100 cm3 Ans.a (7)

44. How many grams of dibasic acid should be present in 100 mL of its aqueous solutions to give decionormal strenght

a. 1g b. 2g c. 10 g d. 20 g Ans. a (3)

44. A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion A punctured with a pin, the thread.

(a) Becomes concave toward A (b) Becomes convex towards A (c) Remains in the initial position (d) Either (a) or (b) depending on the size of A w.r.t. B Ans. a (15)

43. A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will

(a) 0.07 N (b) 0.06 N (c) 0.01 N (d) 0.02 N Ans. d (11)

42. The dimensions of surface tension are

(a) MLT-1 (b) ML2 T-2 (c) ML0 T-2 (d) ML-1T-2 Ans. c (9)

41. The property utilized in the manufacture of lead shots is

(a) Specific weight of liquid lead (b) Specific gravity of liquid lead (c) Compressibility of liquid lead (d) Surface tension of liquid lead Ans. d (6)

40. Cohesive force is experienced between

(a) Magnetic substances (b) Molecules of different substances (c) Molecules of same substances (d) None of these Ans. (c) The cohesive force is the force of attraction between the molecules of same substance (15)

39. Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to

(a) Surface tension of water is very high (b) Surface tension of water is very low (c) Viscosity of oil is high (d) Viscosity of water is high Ans. a (58)

43. With 63 g of hydrated oxalic acid how many L of N/10 solution can be prepared

a. 100 L b. 10 L c. 1L d. 1000 L Ans. b (8)

38. The force required to separate two glass plates of area

The force required to separate two glass plates of area 10-2m2 with a film of water 0.05 mm thick between them, is (Surface tension of water is 70 x 10-3 N/m) (a) 28 N (b) 14 N (c) 50 N …

37. Due to which property of water, tiny particles of camphor dance on the surface of water

(a) Viscosity (b) Surface tension (c) Weight (d) Floating force Ans. b (12)

42. Which of the following solutions has the highest normality

a. 8 g of KOH / L b. N phosphoric acid c. 6 g of NaOH/ 100 mL d. 0.5 M H2 SO4 Ans. c (13)

36. It is easy to wash clothes in hot water because its

(a) Surface tension is more (b) Surface tension is less (c) Consumes less soap (d) None of these Ans. (b) Surface tension of water decrease with rise in temperature. (9)

41. The normality of a solution of sodium hydroxide 100 mL of which contains 4 grams of NaOH is

a. 0.1 b. 40 c. 1.0 d. 0.4 Ans. c (11)

35. A 10 cm long wire is placed horizontally on the

A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 ×10-2 N to keep the wire in equilibrium. The surface tension, in Nm-1, of water is (a) …

40. The amount of

K2 Cr2 O7 required to prepare 100 mL of its 0.05 N solution is a. 2. 9424 g b. 0.4904 g c. 1.4712 g d. 0.2452 g Ans. d (8)

39. The volumes of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCl are

a. 0.75 litre of 10 N HCl and 0.25 litre of 4 N HCl b. 0.25 litre of 4 N HCl and 0.75 litre of 10 N HCl c. 0.67 litre of 4 N HCl and 0.33 litre of 10 …

34. A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle θ with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

(a) 2πrT + W (b) 2πrT COSθ – W (c) 2πrT COSθ +W (d) W-2πrT COSθ Ans. c (11)

30. If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained

a. 1.5 M b. 1.66 M c. 0.017 M d. 1.59 M Ans. b (8)

38. The concentration of

H2 O2 solution of ’10 volume’ is a. 30% b. 3% c. 1% d. 10% Ans. b (5)

33. Small liquid drops assume spherical shape because

(a) Atmospheric pressure exerts a force on a liquid drop (b) Volume of a spherical drop is minimum (c) Gravitational force acts upon the drop (d) Liquid tends to have the minimum surface area due to surface tension Ans. (d) …

37. A certain aqueous solution of

FeCl3 (formula mass = 162 ) has a density of 1.1 g/mL and contains 20.o% FeCl3 . Molar concentration of this solution is a. 0.028 b. 0.135 1.27 d. 1. 47 Ans. b (13)