2022Flame Institute

13. Assertion : Hot soup tastes better than the cold soup. Reason : Hot soup has high surface tension and it does not spread properly on our tongue.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and …

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 (b) If both the assertion and reason are true but the reason is not 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 same freezing points d. Different boiling and different freezing points Ans. c Explanation : Depression in freezing point and elevation …

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

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

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 (10)

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 b. 0.167, 11. 11 c. 0.167, 22. 20 d. 0.2, 22.20 Ans. b (9)

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 (6)

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

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 (2)

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. 16 b. 12 c. 8 d. 4 Ans. d (55)

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

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 expression and volume is temperature dependent. (9)

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

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 (7)

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

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. 0.086 d. 0.050 Ans. c (6)

3. Assertion : When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. Reason : Product of radius of meniscus and height of liquid in capillary tube always remains constant.

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

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. of moles per 1000 gmof solvent. m = 1000/18 = 55.5 (14)

1. Assertion : It is easier to spray water in which some soap is dissolved. Reason : Soap is easier to spread.

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.

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. 18 Ans. c (6)

12. Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.

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

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. 10 Ans. b (21)

11. Assertion : Tiny drops of liquid resist deforming forces better than bigger drops. Reason : Excess pressure inside a drop is directly proportional to surface tension.

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

91. What does not change on changing temperature

a. Mole fraction b. Normality c. Molality d. None of these Ans.a (14)

10. Assertion : A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube. Reason : The excess pressure inside bubble (or drop) is inversely proportional to the radius.

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 (10)

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

9. Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.

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 (14)

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

8. Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension does not hold for gases.

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

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 a. 0.805 M, 4. 83 N, O.825 m b. 0.805 M, 48.3 N, O.80s m c. 4.83 M, 4. 83 …