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jyoti

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23. The mass of a non volatile solute of molar mass 40 g

mol-1  that should be dissolved in 114 g of octane to lower its vapour pressure by 20  % is a....

22.

PA   and PB  are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution....

Assertion : Homosporous pteridophytes are exosporic. Reason : Heterosporous pteridophytes are endosporic.

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

8. According to Raoult’s law the relative lowering of vapour pressure of a solution of non-volatile substance is equal to

a. Mole fraction of the solvent b. Mole fraction of the solute c. Weight percentage of a solute d Weight...

19. Vapour pressure of pure ‘A’ is 70 mm of Hg at

25° C. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour...

11. The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

a. 140 torr b. 20 torr c. 68 torr d. 72 torr Ans. d (60)

4. The vapour pressure of water at

20° C is 17.5 mmHg. if 18 g of glucose is added to 178.2 g of water at 20° C...

9. Which colligative property is more useful to determine the molecular weight of the substance like proteins and polymers

a. Lowering of vapour pressure b.Elevation in boiling point c. Depression of freezing point d. Osmotic pressure Ans. d (4)

7. Which has highest freezing point

a. 1 m K [ Fe (CN)6 ]  solution b. 1 m C6 H12 O6 solution c. 1 m KCl solution...

6. The magnitude of colligative properties in all colloidal dispersions is….than solution

a. Lower b. Higher c. Both d.None Ans. a   (6)

Assertion : The growth of Funaria stem occurs by a single cell. Reason : It’s position is apical.

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

7. Benzene and toluene form nearly ideal solutions. At

20° C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour...

5. Which of the following statements is false

a. Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing...

21. On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressure of the two liquid components are 105

κPa abd 45 κPa  respectively. Vapour pressure of the solution obtained by mixing 25.0g of heptane and 35 g of...

20. At 300 K two pure liquids A and B have vapour pressure respectively 150 mm Hg. In an equimolar liquid mixture of A and B, the mole fraction of B in the vapour mixture at this temperature is

a. 0.6 b. 0.5 c. 0.8 d. 0.4 Ans. d Explanation : In equimolar liquid mixture x   = 0.5 x...

18. Which of the following can be measured by the ostwald-walker dynamic method

a. Vapour pressure of the solvent b. Relative lowering of vapour pressure c. Lowering of vapour pressure d. All of...

17. Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ration of 1:1 and a vapour pressure of 350 mm when mixed in the molar ration of 1 : 2 at the same temperature. The vapour pressure of the two pur liquids X and Y respectively are

a.  250 mm, 550 mm b. 350 mm, 450 mm c. 350 mm, 700 mm d. 500 mm, 500 mm...

16. The vapour pressure of a solvent A is 0.08 atm when a non volatile substance B is added to this solvent its vapour pressure drops to 0.6 atm. What is mole fraction of B in solution

a. 0.25 b. 0.50 c. 0.75 d. 0.90 Ans. a (12)

15. The vapour pressure of a solvent decreased by 10mm of mercury, when a non volatile solute was added to the solvent. The mole fraction of the solute in the solutions is 0.2. What should be the mole fraction of the solvent, if decrease in the vapour pressure is to be 20mm of mercury

a.  0.8 b. 0.6 c. 0.4 d. 0.2 Ans. b (8)

14. In an experiment, 1 gof a non -volatile solute was dissolved in 100 g of acetone at 298 K. The vapour pressure of the solution was found to be 192.5 mmHg. The molecular weight of the solute is (vapour pressure of acetone = 195 mmHg)

a. 25.24 b. 35.24 c. 50 d. 55. 24 Ans. c (5)

13. 60g of Urea was dissolved in 9.9 moles, of water. if the vapour pressure of pure water is

Po , the vapour pressure of solution is a. 0.10 Po b. 1.10 Po c. 0.90  Po d. 0.99 Po Ans....

12. The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non volatile and non electrolyte solid weighing 2.175 g is added to 39.08 g of benzene. The vapour pressure of the solutions is 600 mm of Hg. What is the molecular weight of solid substance

a. 49.50 b. 59.6 c. 69.5 d. 79.8 Ans. c (44)

3.Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 mole of X and 3 mol of Y is 550 mmHg. At the same temperature, if 1mol of Y is further added to this solution, vapour pressure of the solution increase by 10mmHg, Vapour pressure of X and Y in their pure states will be respectively

a. 200 and 300 b. 300 and 400 c. 400 and 600 d. 500 and 600 Ans. c (5)

2. Vapour pressure of chloroform and dichloromethane at

25° C are 200 mm Hg and 41.5mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5g of...

1. Vapour pressure of

CCl4   at 25° C is 143 mm of Hg. 0.5 g of a non-volatile solute is dissolved in 100 mL....

10. Liquid ‘M’ and liquid ‘N’ form an ideal solution. The vapour pressure of pure liquids ‘M’ and ‘N’ are 450 and 700 mmHg, respectively at the same temperature. Then correct statement is

( x M  = Mole fraction of ‘M’ in solution; xN = Mole fraction of ‘N’ in solution; yM  = Mole fraction of ‘M’...

8. Colligative properties are used for the determination of

a. Molar Mass b. Equivalent weight c. Arrangement of molecules d. Melting point and boiling point e. Both (a) and...

6. At 300 K, when a solute is added to a solvent its vapour pressure over the mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be

a.  0.005 b. 0.010 c. 0.100 d. 0.900 Ans. c   (16)

9. Whe n a substance is dissolved in a solvent, the vapour pressure of the solvent is decreased.. This results in

a. An increase in the boiling point of the solution b. a decrease in the boiling point of solvent c....

Assertion : Paroicous mosses have both sex organs intermingled together. Reason : Autoicous mosses bear sex organs on different branches.

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

5. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290mm at 300 K. The vapour pressure of propyl is 0.6 it vapour pressure at the same temperature will be

a. 350 b. 300 c. 700 d. 360 Ans. a (11)

4. Which of the following aqueous solutions has the highest boiling point

a. 0.1 M KNO3 b. 0.1 M Na3  PO4  c. 0.1 M BaCl2 d. 0.1 M K2 SO4 Ans. b...

22. Assertion : Unlike thallophytes, bryophytes show formation of embryo. Reason : The embryo gives rise to gametophyte plant of bryophytes.

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

32. Assertion : The young stem of Funaria is photosynthetic. Reason : It contain hydroids.

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

Assertion : The sporogonium of Riccia is the simplest among the liverworts. Reason : Sporophyte consists of capsule only

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

10. “Relative lowering in vapour pressure of solution containing non-volatile solute is directly proportional to mole fraction of solute”. Above statement is

a. Henry law b. Dulong and petit law c. Raoult’s law d. Le – Chatelier’s principle Ans. c (21)

Assertion : Sperms of Riccia are biflagellate. Reason : Sperms show swimming nature.

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

Assertion : The primary protonema of moss by death and decay of cells may break into fragments. Reason : Each fragment gives rise to leafy gametophyte.

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

Assertion : Sporogonium of Riccia is totally dependent on the gametophyte. Reason : Sporogonium of Marchantia is partly dependent on the gametophyte.

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

63. NaClO solution reacts with

H2 SO 3 as, NaClO + H2SO 3   → NaCl + H2 SO4 . A solution of NaClO used in...
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