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jyoti

HomeAuthor: jyotiPage 7

Assertion : In green algae, the eye-spot is present in the cell. Reason : Eye-spot is meant for respiration.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pyrenoids are utilised during starvation. Reason : Pyrenoids are proteinaceous bodies.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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...

Assertion : Bryophytes and tracheophytes have an embryo stage in their life cycle. Reason : Embryophyta are terrestrial plants.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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)

Assertion : Each group of algae has a characteristic colour. Reason : Each group of algae show predominance of one pigment.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Algae and fungi are grouped in thallophyta. Reason : Algae and fungi show no differentiation in thallus.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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)

Assertion : Algae is a collective term for all those chlorophyll bearing organisms which are thalloid. Reason : Presently algae are grouped in three kingdom.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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)

Assertion : Heterotrichous filaments are more advanced than branched filaments. Reason : Heterotrichous filaments have prostrate and projecting system.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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....

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