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2022

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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...

5. Assertion : A large force is required to draw apart normally two glass plate5. Assertion : A large force is required to draw apart normally two glass plates enclosing a thin water film. Reason : Water works as glue and sticks two glass plates. s enclosing a thin water film. Reason : Water works as glue and sticks two glass plates.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

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...

46. Surface tension may be defined as

(a)  The work done per unit area in increasing the surface area of a liquid under isothermal condition (b)  The...

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...

45. The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)

(a) 280  π dyne (b) 250 π dyne (c)  140 π dyne (d) 210 π dyne Ans. a (44)

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)

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...

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)

2. Assertion : Spring balances show correct readings even after they had been used for a long time interval. Reason : On using for long time, spring balances losses its elastic strength.

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

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...

10. Assertion : Young’s modulus for a perfectly plastic body is zero. Reason : For a perfectly plastic body, restoring force is zero.

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

9. Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing. Reason : Ivory and wet-clay have same elasticity.

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

8. Assertion : The bridges declared unsafe after a long use. Reason : Elastic strength of bridges losses with time.

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

7. Assertion : Strain is a unitless quantity. Reason : Strain is equivalent to force.

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

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...

6. Assertion : Bulk modulus of elasticity (K) represents incompressibility of the material. Reason : Bulk modulus of elasticity is proportional to change in pressure.

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

5. Assertion : A hollow shaft is found to be stronger than a solid shaft made of same material. Reason : The torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of same size and material.

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

4. Assertion : Glassy solids have sharp melting point. Reason : The bonds between the atoms of glassy solids get broken at the same temperature.

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

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....

3. Assertion : Steel is more elastic than rubber. Reason : Under given deforming force, steel is deformed less than rubber.

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

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...

1. Assertion : The stretching of a coil is determined by its shear modulus. Reason : Shear modulus change only shape of a body keeping its dimensions unchanged.

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

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....

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