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Chemistry

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91. What does not change on changing temperature

a. Mole fraction b. Normality c. Molality d. None of these Ans.a (18)

90. What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water

a. 0.1 m b. 1 M c. 0.5m d. 1 m Ans.d (11)

89. The density of 3M solution of NaCl is 1.25

gL-1 . The molality of this solution is a. 2.79 b. 1.79 c. 0. 79 d. 2.98 Ans. a (15)

88. A solution of

Al2 (SO4)3  {d= 1.253 gm/mL } contain 22% salt by weight. The molarity, normality and molality of the solution is...

87. Which of the following modes of expressing concentration is independent of temperature

a. Molarity b. Molality c. Formality d. Normality Ans. b Explanation :  Calculation of molality does not have a volume ...

86. 25g of a solute of molar mass 250 g

mol-1   is dissolved in 100 mL of water to obtain a solution whose density is 1.25 g mL-1  The molarity and...

76. What will be the molality of a solution having 18g of glucose dissolved in 500g of water

a. 1m b. 0.5 m c. 0.2 m d. 2m Ans. c (8)

75. The degree of hardness of water is usually expressed in terms of

a. ppm by weight of MgSO4 b. g/L of CaCO3  and MgCO3 c. ppm by weight of CaCO 3 irrespective of...

74. An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The Value of X is

a.  14 b. 3.2 c. 4 d. 2 Ans. b (9)

73. The mole fraction of the solute in one molal aqueous solution is

a. 0.027 b. 0.036 c. 0.018 d. 0.009 Ans. c (10)

71. A 500 g tooth paste sample has 0.2g fluoride concerntration. What is the concentration of F in terms of ppm level

a. 250 b. 200 c. 400 d. 1000 Ans. c (7)

72. With increase of temperature , which of these changes

a. Molality b. Weight fraciton of solute c. Fraction of solute present in water d. Mole fraction Ans. c Explanation...

70. What is the mole fraction of the solute in a 1.00 m aqueous solution

a. o.177 b. 1.770 c. 0.0354 d. 0.0177 Ans. d (6)

60. The normality of 0.3 M phosphorus acid is

a. 0.1 b. 0.9 c. 0.3 d. 0.6 Ans. d (17)

68. When 6 g urea dissolve in 180 g

H2 O. The mole fraciton of urea is a. 10/10.1 b. 10.1/10 c.10.1/0.1 d.  0.1/10.1 Ans. d (10)

69. A molal solution is one that contains one mole of a solute in

a. 1000 g of the solvent b. One litre of the solvent c. One litre of the solution d. 22.4...

67. 1000 gms aqueous solution of

CaCO3  contains 10 gms of carbonate. Concentration of the solution is a. 10 ppm b. 100 ppm c. 1000 ppm d....

66. The mole fraction of water in 20% aqueous solution (By weight ) of

H2  O2  is a. 77/68 b. 68/77 c. 20/80 d. 80/20 Ans. b (54)

65. When a solute is present in trace quantities the following expression is used

a. Gram per million b. Milligram percent c. Microgram percent d. Nano gram percent e. Part per million Ans. e...

64. The normality of 10 lit. volume hydrogen peroxide is

a.  0. 176 b. 3. 52 c. 1. 78 d. 0.88 e. 17. 8 Ans. c (9)

61. 5 mL of NHCl, 20 mL of N/2

H2 SO4 and 30 mL of N/3 HNO3  are mixed together and volume made to one litre. The normality of...

62. Conc.

H 2 SO4  has a density of 1.98 g/mL and is 98% H2 SO4 by weight. Its normality is a. 2N...

59. What weight of hydrated oxalic acid should be added for complete neuralisation of 100 mL of

0.2 N – NaOH solution. a. 0.45 g b. 0.90 g c. 1.08 g d. 1. 26 g Ans. d...

56. 2NHCl solution will have same molar conc. as a

a.  4.0N H2 SO4 b. 0.5 N H2 SO4 c. 1 N H2 SO4 d. 2N H2  SO4 Ans. a...

57. 10

cm3  of   0.1 N monobasic acid requires 15 cm3   of sodium hydroxide solution whose normality is a. 0.066 N b. 0....

58. Assuming that sea water is an aqueous solution of NaCl its density is 1.025 g/mL at

20°  C and NaCl concentration is 3.5% the normality of the sea water is a.  0.65 N b. 0.68 N c....

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 (13)

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....

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 (12)

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....

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 (12)

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 (10)

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...

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...

48. A solution contains

1.2046 x 106  hydrochloric acid molecules in one dm3  of the solution . The strength of the solution is a....

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....

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 ...

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 (5)

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 (9)

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...
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