Class 12th chemistry Chapter -2 most VVI Objective for Bihar board and all other board
solution
1. Which of the following is non-colligative property :
(A) Depression in freezing point
(B) Elevation in boiling point
(C) Optical activity
(D) Relative lowering of v.p
Ans-(D)
2. Volume of one mole of any gas at NTP is :
(A) 11.2 liter
(B) 22.4 liter
(C) 10.2 liter
(D) 22.8 liter
Ans- B
3. 234.2 gram of sugar syrup contains 342 gram of sugar. what is the molal concentration of the solution ?
(A) 0.1
(B)0.5
(C)5.5
(D)55
Ans- A
4. Molarity is expressed in :
(A) Grams/litre
(B) Liter/mol
(C) Mole/liter
(D) Mole/100gm
Ans- C
5. Increasing the temperature of an aqueous solution bill cause :
(A) Decrease in molarity
(B) Increase in molarity
(C) Decrease in mole fraction
(D) Decrease in %w/w
Ans- A
6. What is true for mole-fraction :
(A) X<1
(B) -2<x<2
(C) 0<x<1
(D) non-negative
Ans-C
7. For the colligative properties of solution which one is the best method for the determination of molecular weight of proteins and polymer ?
(A) Osmotic pressure
(B) Lowering of V.P.
(C) Lowering of F.P.
(D) Elevation of B.P.
Ans- A
8. Which of the following is a colligative property.
(A) Viscosity
(B) Surface tension
(c) Refractive index
(D) Osmotic pressure
Ans- D
Class 12th chemistry Chapter -2 Most VVI Objective
9. Which of the following exhibits the highest osmotic pressure in 0.1M solution at 25°C ?
(A) cacl2
(B) KCl
(C) Glucose
(D) Urea
Ans- A
10. The boiling point of n a azeotropic mixture of water and etheanol is less than date of water and ethanol. the mixture shows :
(A) Negative deviation from Raoult’s law
(B) Positive deviation from Raoult’s law
(C) No deviation from Raoult’s law
(D) devitation which can not predicted from the given information
Ans- B
11. When mercuric iodide is added to the aqueous solution of potassium iodide : the :
(A) Freezing point raised
(B) Freezing point is lowered
(C) Freezing point does not change
(D) Boiling point does not change
Ans- A
12. The molecular weight of benzoic acid in benzene as determined why depression in freezing point method crosponds to :
(A) Ionisation of benzoic acid
(B) Demerisation of benzoic acid
(C) Trimerisation of of benzoic acid
(D) salvation of benzoic acid
Ans- B
13. If liquid A and B from an ideal solution
(A) The entropy of mixing is zero
(B) The free energy of mixing is zero
(C) The free energy as well as the entropy of mixing are each zero
(D) the enthalpy of mixing zero
Ans- D
Class 12th chemistry Chapter -2 most VVI Objective
14. During depression is freezing point of a solution the following are in equilibrium
(A) Liquid solvent’ solid solvent
(B) Liquid solvent’ solid solute
(C) Liquid solid’ solid solute
(D) liquid solute’ solid solvent
Ans- A
15. 25 ML of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid give a letter value of 35 ML. The molarity of barium hydroxide solution was:
(A) 0.14
(B) 0.28
(C) 0.35
(D) 0.07
Ans- D
16. Mhe depression in freezing point of 0.01 M aqueous solution of urea sodium chloride and sodium sulphate in the ratio of :
(A) 1 : 1 : 1
(B) 1 : 2 : 3
(C) 1 : 2 : 4
(D) 2 : 2 : 3
Ans- B
17. which of the following modes of expressing concentration in independent of temperature ?
(A) Molarity
(B) Molality
(C) Formality
(D) Normality
Ans- B
18. a compound X undergoes tetermerisation in a given organic solvent. the wan’t how factor is :
(A) 4.0
(B) 0.25
(C) 0.125
(D) 2.0
Ans- B
Class 12th chemistry Chapter -2 most VVI Objective
19. A pressure cooker reduces cooking time for food because :
(A) Hate is more evently distributed in the cooking space
(B) boiling point of water involved in cooking is increased
(C) The higher pressure inside the cooker process the food material
(D) Cooking involve chemical changes helped by arise in temperature
Ans- B
20. Increasing the temperature of an aqueous solution will cause
(A) Decrease in molality
(B) Decrease in molarity
(C) Decrease in mole fraction
(D) decrease in % W/W
Ans- B
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