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jyoti

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77. The molality of 90%

H2 SO4 solution is a. 1.8 b. 48.4 c. 91.83 d. 94.6 Ans. c (8)

2. Which of the following is a colligative property

a. Osmotic pressure b. Boiling point c. vapour pressure d. Freezing point Ans. a (15)

Assertion : All bryophytes are land dwellers. Reason : Water is necessary to complete their life-cycle.

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

Assertion : Meiospores form genetically and functionally different progenies. Reason : Mitospores form progenies identical to parents.

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

85. 4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molality of the resultant solution is

a. 0.004 b. 0.008 c. 0.012 d. 0.016 Ans. d (10)

Assertion : Spirogyra shows anisogamy. Reason : Gametes are identified on the basis of their motility.

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

84. Calculate the molality of a solution that contains 51.2g of nephthalene, in 500 mL of carbon tetrachloride. The density of

CCl4  of 1.60 g/ml a. 0.250 m b. 0.500 m c. 0.750 m d. 0.840 m e. 1.69 m Ans. b...

80. Density of a 2.05 M solution of acetic acid in water is 1.02 g/ml. The molality of the solution is

a. 1.14 mol kg -1 b. 3.28 mol kg -1 c. 2.28 mol kg -1 d.0.44 molkg -1 Ans. c (11)

Assertion : Spermatangium of red algae bears trichogyne. Reason : Trichogyne helps in reproduction.

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

79. Calculate the molaity of 1 litre solution of 93%

H 2 SO4 . The density of the solution is 1.84 g/ml a. 10.43 b. 20.36 c. 12.05 d. 14.05 Ans....

Assertion : Riccia is many cells thick. Reason : Riccia has both assimilatory region and storage region.

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

3. The colligative properties of a solution depend on

a. Nature of solute particles present in it b. Nature of solvent used c. Number of solute particles present in...

Assertion : Liverworts fail to spread to a new locality through fragmentation. Reason : Gemmae are helpful in propagating liverworts in different locality.

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

Assertion : The embryo of bryophyte is independent. Reason : The zygote of thallophyte is dependent.

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

1. Equimola solutions in the same solvent have

a. Same boiling point but different freezing point b. Same freezing point but different boiling point c. Same boiling and...

Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium

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

Assertion : The bryophytes exist in two phases – gametophyte and sporophyte. Reason : The sporophyte is nutritionally independent.

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

98. The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality of the aqueous solutions is

a. 13.88 x 10 -3 b. 13.88 c. 13.88 x 10-2 d. 13.88 x 10-1 Ans. b (12)

97. 8g of NaOH is dissolved in 18 g of

H2 O. Mole fraction  of NaOH in solution and molality of the solutions respectively are : a. 0.2, 11. 11...

96. 50mL of 0.5M oxallic acid is needed to neutralize 25mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is:

a. 10 g b. 40g c. 80 g d. 4g Ans. d (7)

Assertion : The sex organs in the bryophytes are jacketed. Reason : Bryophytes are land plants.

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

95. 25mL of the given HCl solution requires 30mL of 0.1M sodium carbonate solution.What is the volume of this HCl solution required to titrated 30mL of 0.2M aqueous NaOH solution

a. 12.5mL b. 75 mL c. 50 mL d. 25mL Ans. d (3)

94. A solution of sodium sulphate contains 92g of

Na+     ions per kilogram of water. The molality of  Na+     ions in that solution in mol kg-1  is : a....

Assertion : Red algae contribute in producing coral reef. Reason : Some red algae secrete and deposit calcium carbonate our their walls.

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

93. Which of the following is dependent on temperature

a. Molality b. Molarity c. Mole fraction d. Weight percentage Ans. b Explanation : Molarity has volume term in its...

Assertion : Spirogyra shows haplontic life cycle. Reason : Zygotic meiosis occurs in Spirogyra.

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

83. What will be the value of molality for an aqueous solution of 10% w/w NaOH.

a.  2.778 b. 5 c. 10 d. 2.5 Ans. a (9)

Assertion : Isogamy is a primitive type of sexual reproduction. Reason : The gametes are of different sizes.

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

82. A 5.2 molal aqueous solution of methyl alcohol,

CH3  OH , is supplied. What is the mole fraction of methly alcohol in the solution a. 0.100 b. 0.190 c....

Assertion : Spirogyra is slippery in touch. Reason : Spirogyra consists a gelatinous sheath.

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

81. What is the molality of pure water

a. 1 b. 18 c. 55.5 d None of these Ans. c Explanation :  Molality is defined as the no....

Assertion : Only red algae are able to flourish at the great depth of sea. Reason : Red algae has the pigments r-phycoerythrin and r-phycocyanin.

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

78. Molarity of

H2 SO4  is 18 M. Its density is 1.8 g/mL. Hence molality is a. 36 b. 200 c. 500 d....

Assertion : Zygospore of Ulothrix forms meiozoospores and meioaplanospores. Reason : Both are motile.

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

92. The weight percent of sucrose in an aqueous solution is 3.42. The density of the solution is

1g mL-1  , the concentration of sucrose in the solution in mol L-1  is: a. 0.01 b. 0.1 c. 1.0 d....

Assertion : All the cells Ulothrix filament are alike. Reason : Ulothrix filament is unbranched.

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

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)

Assertion : Chlorella could be utilised to keep the air in space vehicles. Reason : The space travellers feed on Chlorella soup.

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

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)
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