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June 2022

Home2022JunePage 4

23. Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressures of pure A and pure B are 7 x

103  Pa and  12 x 103  Pa, respectively. The containing 40 mole percent of A at this temperature is :...

17. Formation of a solution from two components can be considered as

i.  Pure  solvent  →   separated  solvent molecules  ΔH1 ii. Pure solvent  →   separated  solvent molecules  ΔH2 iii. Separated solvent and...

16. Which one of the following is incorrect for ideal solution

a.   ΔG mix  = 0 b. ΔH mix  = 0 c. ΔU mix  = 0 d. ΔP =  P obs  – P calculated by...

21. The solution containing 4.0gm of a polyvinyl chloride polymer in 1 liter of dioxane was found to have an osmotic pressure

6.0 x 10 -4  atmosphere at 300K, the value of R used is 0.082 litre atmosphere  K . The molecular -1  K...

19. Osmotic pressure of a urea solution at

10 ° C  is 500 mm. Osmotic pressure of the solution become 105.3 mm. when it is dilute and temperauter...

18. Two solutions of

KNO3  and CH3 COOH  are prepared separately. Molarity of both is 0.1 M and  osmotic pressures are  P1 and P2...

17. A solution containing 10 g per

dm3  of urea is isotonic with a 5 % solution of a nonvolatile solute. The molecular mass of this nonvolatile...

16. Which has minimum osmotic pressure

a. 200 mL of 2 M NaCl solution b. 200 mL of 1 M glucose solution c. 200 mL of...

15. A 5 solution of sugarcane is isotonic with 1 % solution of X under similar conditions. the mole.wt. of X is

a. 136. 2 b. 68.4 c. 34.2 d. 171. 2 Ans. b (8)

14. A 0.6 % solution of urea would be isotonic with

a. 0.1M gulcose b. o.1 M KCl c. 0.6% glucose solution d. 0.6 % KCl solution Ans. a Explanation :...

13. Isotonic solutions have

a. Equal temperature b. Equal osmotic pressure c. Equal volume d. Equal amount of solute Ans. b (5)

12. What would happen if a thin slice of suger beet is placed in a concentrated solution on NaCl

a. Sugar beet will lose water from its cells b. Sugar beet will absorb water from solution c. Sugar beet...

11. A 5.25% solution of a substance is isotonic with a 1.5 % solution of urea in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0

gcm-3 , molar mass of the substance will be a. 90.0 g mol -1 b. 115.0 g mol -1 c. 105.0 gmol -1 d....

10. The solution in which the blood cells retain their normal form are with regard to the blood

a. Isotonic b. Isomotic c. Hypertonic d. Equinormal Ans. a Explanation : Isotonic mixtures have equal osmotic pressure so there...

9. If 20 g of a solute was dissolved in 500 mL of water and osmotic pressure of the solution was found to be 600 mmm of Hg at

15° C , then molecular weight of the solute is a. 1000 b. 1200 c. 1400 d. 1800 Ans. b...

8. The average osmotic pressure of human blood is 7.8 bar at

37 ° C . What is the concentration of an aqueous NaCl a. 0.16 mol/L b. 0.32 mol / L...

7. Which of the following colligative properties can provide molar mass of protenis with greater precision

a. Relative lowering of vapour pressure b. Elevation of boiling point c. Depression in freezing point d. Osmotic pressure e....

6. Two solutions A and B are separated by semi- permeable membrane. If liquid flows form A to B then

a. A is less concentrated than B b. A is more same concentration c. Both have same concentratio d. None...

5. Semipermeable membrane is that which permits the passage of

a. Solute molecules only b. Solvent molecules only c. Solute and solvent molecules both d. Neither solute nor solvent molecules...

4. The relationship between osmotic pressure at 273 K when 10g glucose

(P1 ) , 10 g urea (P2 ) and 10g sucrose (P3) are dissolved in 250 mL of water is a. P1...

22. What is ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1 large drop

(a)  100 : 1 (b)  1000 : 1 (c)   10 : 1 (d)  1 : 100 Ans. d (6)

21. The surface tension of liquid is 0.5 N/m. If a film is held on a

The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m2,...

19. The surface tension of a liquid at its boiling point

(a)   Becomes zero (b)  Becomes infinite (c)   is equal to the value at room temperature (d)  is half to the...

19. A non ideal solution was prepared by mixing 30 mL chloroform and 50 mL acetone. The volume of mixture will be

a. > 80 mL b. < 80 mL c. = 80 mL d. ≥ 80 mL Ans. b (26)

20. If a 0.1 M solution of glucose and 0.1 molar solution of urea are placed on the two sides of a semipermeable membrane to equal heights, then it will be correct to say

a. There will be no net movement across the membrane b. Glucose will flow across the membrane into urea solution...

26. One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is

(a)  1000 : 1 (b)  1 : 1000 (c)  10 : 1 (d) 1 : 10 Ans. d (5)

6. The system that forms maximum boiling azeotrope is

a. Carbondisulphide – acetone b. Benzene – toluene c. Acetone – chloroform d. n- hexane – n- heptane e. Ethanol...

1. The azetropic mixture of water (b.p.

100° C)  and HCl (b.p. 85° C) boils at 108.5 ° C. When this mixture is distilled it is possible...

21. A liquid is flowing in a horizontal uniform capillary tube under a constant pressure difference P. The value of pressure for which the rate of flow of the liquid is doubled when the radius and length both are doubled is

(a)   P                                     ...

22. Assuming ideal behaviour the change enthalpy and volume of mixing of two liquids, respectively are

a. Zero and zero b. +ve and zero c. -ve and zero d. -ve and -ve Ans. a (6)

18. Which one of the following is non-ideal solution

a. Benzene + toluene b. n – hexane + n – heptane c. Ethyl bromide +ethyl iodide d. CCl4  +...

18. Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be

(a)  10 cm per sec                            (b)  2.5 cm per sec (c) 5×4¹/3   per sec             ...

21. When one of the following non- ideal solutions shows the negative deviation

a. CH3  COCH3 + CS2 b. C 6 H 6 + CH3 COCH3 c. CCl4+ CHCl3 d. CH3  COCH + CHCl3 Ans....

17. The surface tension of a soap solution

is 2 x 10-2 N/m. To blow a bubble of radius 1 cm, the work done is  (a)    4 π...

30. When

106 small drops coalesce to make a new larger drop then the drop (a)  Density increases (b)  Density decreases (c)  ...

2. A solution contains non-volatile solute of molecular mass

Mp . Whih of the following can be used to calculate molecular mass of the solute in terms of osmotic pressure...

29. A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is

(a)    R/2 (b)   R/5 (c)   R/6 (d)  R/10 Ans. d (11)

28. If σ be the surface tension, the work done in breaking a big drop of radius R in n drops of equal radius is

(a) Rn(2/3) σ (b) (n(2/3) – 1) Rσ (c) (n(1/3) – 1) Rσ (d) 4Ï€R2(n(1/3) – 1)σ (e) [1/( n(1/3)...

11. The mixture that forms maximum boiling azeotrope is

a. Heptane + Octane b. Water + Nitric acid c. Ethanol + water d. Acetone + Carbon disulphide Ans. b...

10. Azeotropic mixture of HCl and water has

a. 84% HCl b. 22.2% HCl c. 63% HCl d. 20.2 % HCl Ans.d Explanation : It is known that...
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