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2022

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24. The vapour pressure of acetone at

20° C is 185 torr. When 1.2 g of a non volatile substance was dissolved in 100 g of acetone...

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....

6. It is not possible to write directly on blotting paper or newspaper with ink pen

(a)   Because of viscosity (b)  Because of inertia (c)   Because of friction (d)  Because of capillarity Ans. d (52)

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...

12. The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

(a)  Attracted when x lies between A and B and are repelled when X lies between B and C (b)  ...

11. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. P and Q represent

(a)   P = applied force, Q = extension (b)   P = extension, Q = applied force (c)   P = extension,...

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...

2. A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent of heat is J, then the rise in temperature will be

(a)     2T/rJ (b)    3T/RJ (c)    3T/J[(1/R )-(1/R)] (d)   2T/J[(1/r)-(1/R)] Ans. c (32)

6. The diagram shows a force-extension graph for a rubber band. Consider the following statementsI. It will be easier to compress this rubber than expand it II. Rubber does not return to its original length after it is stretched III. The rubber band will get heated if it is stretched and released Which of these can be deduced from the graph

(a)   III only                                   (b)   II and III (c)   I and III                                  (d)   I only Explanation-a (14)

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

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

5. The strain-stress curves of three wires of different materials are shown in the figure. P, Q and R are the elastic limits of the wires. The figure shows that

(a)   Elasticity of wire P is maximum (b)   Elasticity of wire Q is maximum (c)   Tensile strength of R is...

1. There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the loop be T, then what will be the tension in the thread

(a)   πR2/T (b)   πR2T (c)   2πRT (d)   2RT Ans. d (22)

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...

2. Due to capillary action, a liquid will rise in a tube, if the angle of contact is

(a)   Acute (b)  Obtuse (c)   90° (d)  Zero Ans.  a (4)

1. When two capillary tubes of different diameters are dipped vertically, the rise of the liquid is

(a)  Same in both the tubes (b)  More in the tube of larger diameter (c)   Less in the tube of...

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...

4. In a surface tension experiment with a capillary tube water rises upto 0.1 m. If the same experiment is repeated on an artificial satellite, which is revolving around the earth, water will rise in the capillary tube upto a height of

(a)   0.1 m                                         (b)  0.2 m (c)   0.98 m (d)  Full length of the capillary tube Ans. (d)   In the...

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)

3. An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true

(a)  Bubble rises upwards because pressure at the bottom is less than that at the top. (b)  Bubble rises upwards...

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)

9. The adjacent graph shows the extension

The adjacent graph shows the extension (Δl) of a wire of length 1m suspended from the top of a roof...

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...

8. The load versus elongation graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line

(a)   OD (b)   OC (c)   OB (d)   OA Answer-a (13)

13. The value of force constant between the applied elastic force F and displacement will be

(a)  √3 (b)     1/√3 (c)     1/2 (d)      √3/2 Answer-b (7)

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....

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