12th Chemistry In English

BSEB 12th Chemistry VVI Objective Question Solutions Chapter


1. Which of the following equations represents osmotic pressure ? 

(A) P = CRT 

(B) P= CT / R

(C) P= RC / T

(D) P = RT / C

Answer :- (D)

2. By osmosis Semipermeable membrane (S.P.M.) allows to pass 

(A) solute molecules

(B) solvent molecules

(C) complex ion 

(D) simple ion

Answer :- (B)

3. Which of the following the property of ideal solution ? 

(A) Obeys Raoult’s law

(B) Does not obey Raoult’s law

(C) Both (A) and (B)

(D) None of these 

Answer :- (A)

4. The boiling point of water decreases at high mountains because 

(A) atmospheric pressue is low

(B) temperature is low

(C) pressure is high

(D) more air 

Answer :- (A)

5. Which of the following is a colligative property of solution ? 

(A) Osmosis 

(B) Surface tension

(C) Conductivity 

(D) Half-life period 

Answer :- (A)

6. If 2 gm of  NaOH is present in 200 ml of its solution, its molarity will be: 

(A) 0.25 

(B) 0.5 

(C) 5 

(D) 10 

Answer :- (A)

7. The atmospheric pollution is generally measured in the units of :

(A) mass percentage

(B) volume percentage

(C) volume fraction 

(D) ppm

Answer :- (D)

8. A 5% solution of cane-sugar (molecular weight = 342) is isotinioc with 1% solution of substance X. The molecular weight of X is : 

(A) 342 

(B) 171.2

(C) 68.4 

(D) 136.8 

Answer :- (C)

9. 234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution :-

(A) 0.1

(B) 0.5

(C) 5.5 

(D) 55 

Answer :- (B)

10. H2S is a toxic gas used in qualitative analysis. If solubility of H2S in water at STP is 0.195 m, what is the value of KH?

(A) 0.0263 bar 

(B) 69.16 bar

(C) 192 bar 

(D) 282 bar 

Answer :- (D)

11. Atomic mass is equal to : 

(A) number of electrons of an atom

(B) sum of the numbers of electrons and protons of an atom

(C) sum of the numbers of neutrons and protons of an atom

(D) none of these 

Answer :- (B)

12. among the following substances the lowest vapour pressure is exerted by:

(A) water 

(B) alcohol

(C) ether 

(D) mercury

Answer :- (D)

13. Partial pressure of a solution component is directly proportional to its mole fraction. This is known as 

(A) Henry’s law 

(B) Raoult’s law

(C) Distribution law

(D) Ostwald’s dilution law 

Answer :- (B)

14. Which of the following solutions shows positive deviation from Raoult’s law ?

(A) Acetone + Aniline

(B) Acetone + Ethanol

(C) Water + Nitric acid

(D) Chloroform + Benzen 

Answer :- (B)

15. The system that forms maximum boiling azeotrope is: 

(A) Acetone-chloroform

(B) ethanol-acetone

(C) n-hexane-n-heptane

(D) carbon disulphide-acetonc. 

Answer :- (A)

16. The osmotic pressure of a solution can be increased by 

(A) increasing the volume

(B) increasing the number of solute molecules

(C) decreasing the temperature

(D) removing semipermeable membrane

Answer :- (B)

17. Which aqueous solution has the minimum freezing point ? 

(A) 0.01 M NACI

(B) 0.005 M C2H5OH

(C) 0.005 M Mg12

(D) 0.005 M MgSO4

Answer :- (D)

18. What will be the degree of dissociation of 0.1 M Mg(NO3)2 solution if van’t Hoff factor is 2.74 ? 

(A) 75%

(B) 87%

(C) 100% 

(D) 92% 

Answer :- (B)

19. Which of the following units is useful in relating concentration of solution with its vapour pressure ?

(A) Mole fraction 

(B) Parts per million

(C) Mass percentage

(D) Molality

Answer :- (A)

20. The pH of human blood is approximately :

(A) 6.5 

(B) 7.0

(C) 7.4 

(D) 8.2

Answer :- (C)

21. pH of pure water is : 

(A) 1 

(B) 4

(C) 3 

(D) 7 

Answer :- (D)

22. Which of the following aqueous solutions should have the highest boiling point ? 

(A) 1.0 M NaOH 

(B) 1.0 M Na2SO4

(C) 1.0 M NH4NO3

(D) 1.0 M KNO3

Answer :- (B)

23. The values of van’t Hoff factors for KCI, NaCl and K2SO4, respective are ……

(A) 2, 2 and 2 

(B) 2, 2 and 3

(C) 1, 1 and 2 

(D) 1, 1 and 1

Answer :- (B)

24. Value of Henry’s constant KH ……… 

(A) increases with increase in temperature

(B) decreases with increase in temperature

(C) remain constant

(D) first increases then decreases 

Answer :- (A)

25. The value of Henry’s constant KH is ……. 

(A) greater for gases with higher solubility

(B) greater for gases with lower solubility

(C) constant for all gases

(D) not related to the solubility of gases 

Answer :- (B)

26. A solution has an osmotic pressure of 0.0821 atm. at 300 K. Its concentration should be : 

(A) 0.66 m 

(B) 0.32 m

(C) 0.066 m 

(D) 0.033 m

Answer :- (D)

27. Osmotic pressure can be increased by: 

(A) Increasing temperature

(B) decreasing temperature

(C) increasing volume

(D) none 

Answer :- (A)

28. Which of the following is not a colligative property of solution ?

(A) Depression of freezing point 

(B) Elevation of Boiling point

(C) Relative lowering vapour pressure

(D) Optical activity 

Answer :- (D)

29. If n is number of moles of solute and N is number of mole of solvent then mole fraction strength of solute is: 

(A) n + N

(B) n / N + n

(C) N / N + n

(D) n / N

Answer :- (B)

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