Untitled Document

Question Bank No: 2

1. Which of the following solutions exhibit positive deviation from Raoult's law ?

a)		$H_{2} O + {C_{2} H}_{5} OH$
b)		$C_{6} H_{6} + C_{6} H_{5} C H_{3}$
c)		$H_{2} O + HCl$
d)		CHC $l_{3}$ + (C $H_{3}) 2^{CO}$

2. 4.5 $%$ solution of glucose would be isotonic with respect to ............solution of urea.

a)		4.5 $%$
b)		13.5 $%$
c)		1.5 $%$
d)		9 $%$

3. Which one of the following salt will have the same value of vant Hoff's factor (i) as that of $K_{4} [Fe (CN)_{6}]$ ?

a)		A $l_{2}$ (S $O_{4})_{3}$
b)		NaCl
c)		Al (N $O_{3})_{3}$
d)		${Na}_{2} S O_{4}$

4. A solution containing 6.8 g of non ionic solute in 100 g of water was found to freeze at -0.9 $3^{o}$ C. If $K_{f}$ for water is 1.86, the mol. mass of solute is

a)		13.6
b)		34
c)		68
d)		136

5. Isotonic solution at a particular temperature have the same

a)		density
b)		normality
c)		molar concentration
d)		volume

6. Which one of the following pairs of solution can we expect to be isotonic at the same temperature?

a)		0.1 M urea and 0.1 M NaCl
b)		0.1 M urea and 0.2 M MgC $l_{2}$
c)		0.1 M NaCl and 0.1 M ${Na}_{2} S O_{4}$
d)		0.1 M Ca(N $O_{3})_{2}$ and 0.1 M ${Na}_{2} S O_{4}$

7. Azeotropic mixtures are

a)		constant boiling mixtures
b)		those which boil at different temperatures
c)		mixture of two solids
d)		none of the above

8. If 18g of glucose ( $C_{6} H_{12} O_{6})$ is present in 1000g of an aqueous solution of glucose it is said to be

a)		1 molal
b)		1.1 molal
c)		0.5 molal
d)		0.1 molal

9. How much water is needed to dilute 10 ml of 10N hydrochloric acid to make it exactly deci normal (0.1 N)?

a)		990ml
b)		1000ml
c)		1010ml
d)		100ml

10. The osmotic pressure of a solution is given by the relation

a)		$π = RT / C$
b)		$π = CT / R$
c)		$π = RC / T$
d)		$π / C = RT$

11. A pressure cooker reduces cooking time because

a)		the heat is more evenly distributed
b)		boiling point of water inside the cooker is increased
c)		the high pressure tenderises the food
d)		a longer flame is used

12. Which inorganic precipitate acts as semi permeable membrane?

a)		calcium sulphate
b)		barium oxalate
c)		nickel phosphate
d)		copper ferro cyanide

13. An azeotropic mixture of two liquids boils at a lower temperature than either of these when

a)		it shows negative deviation from Raoult's law
b)		it shows positive deviation from Raoult's law
c)		it does not denote from Raoult's law
d)		it is saturated

14. Which of the following is a colligative property?

a)		melting point
b)		osmotic pressure
c)		freezing point
d)		sublimation temperature

15. For a dilute solution Raoult's law states that

a)		the lowering the vapour pressure is equal to the mole fraction of the solute
b)		the relative lowering of vapour pressure is equal to the mole fraction of the solute
c)		the relative lowering of vapour pressure is proportional to the total amount of solute in solution
d)		the vapour pressure of the solution is equal to the mole fraction of the solvent

16. Which one of the following has highest B.P?

a)		0.1 M glucose
b)		0.1 M BaC $l_{2}$
c)		0.1 M NaCl
d)		0.1 M urea

17. What happens when isotonic solution of A (mol. wt. 342) abnd B (mol. wt. 60) are put into communication through semi permeable membrane?

a)		transference of solvant from solution A to that of B takes place
b)		transference of solvant from solution B to that of A takes place
c)		no transference of solvant from solution A to that of B takes place
d)		chang in temperature of solutions takes place

18. Which of the following 0.1 M aqueous solution will have the lowest freezing point?

a)		potassium sulphate
b)		sodium chloride
c)		urea
d)		glucose

19. The freezing point of 1 molal NaCl solution asuming NaCl to be 100% dissociated in water is

a)		-1.8 $6^{o}$ C
b)		-3.7 $2^{o}$ C
c)		+1.8 $6^{o}$ C
d)		+3.7 $2^{o}$ C

20. The molar freesing point constant for water is 1.8 $6^{o} C / mole .$ If 342 gm of cane/ sugar ( $C_{12} H_{22} O_{11})$ is dissolved in 1000g of water, the solution will freeze at

a)		-1.8 $6^{o}$ C
b)		1.8 $6^{o}$ C
c)		-3.9 $2^{o}$ C
d)		2.4 $2^{o}$ C