Physical Chemistry Class-12 Chapter-2 Solutions Most VVI Objective Questions

Q.1.Which of the following solutions shows positive deviation from Roult’s law ?

(A) Acetone + Aniline

(B) Chloroform + Benzene

(C) Water + Nitric acid

(D) Acetone + Ethanol

Ans :- (D)

Q.2. The system that form maximum boiling azeotrope is

(A) Acetone Chloroform

(B) Carbon disulphide acetione

(C) n- hexane -n- heptane

(D) ethanol acetone

Ans :- (A)

Q.3. Which of the following has maximum depression of freezing point ?

(A) K₂SO₄

(B) NaCl

(C) Urea

(D) Glucose

Ans :- (A)

Q.4. Which among the following does not show positive deviation form Roult’s law ?

(A) Benzene – Chloroform

(B) Benzene – Acetone

(C) Benzene – Ethanol

(D) Benzene – Carbontetrachloride

Ans :- (A)

Q.5. Which among the following is not a colligative property?

(A) ΔTƒ

(B) π

(C) ΔTb

(D) Kb

Ans:- (D)

Q.6. Which of the following aqueous solution 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

Ans :- (B)

Q.7. The law which indicates the relationship between solubility of a gas in liquid and pressure is ……

(A) Raoult’s law

(B) Henry’s law

(C) Lowering of vapour pressure

(D) Van’t Haff law

Ans :- (B)

Q.8. Among the following substances the lowest vapour pressure is exerted by

(A) Water

(B) alcohol

(C) ether

(D) Mercury

Ans :- (D)

Q.9. Partial pressure of a solution component is directly proportional to its mole fraction . This is known as

(A) Henry’s law

(B) Ostwald’s dilution law

(C) Distribution law

(D) Raoult’s law

Ans :- (D)

Q.10. The atmospheric pollution is generally measured in the units of

(A) mass percentage

(B) volume percentage

(C) volume fraction

(D) ppm

Ans :- (D)

Q.11. Which of the following solutions shows nagative deviation form “Roult’s” law ?

(A) Ethanol+ Water

(B) H₂O + HCl

(C) H₂O + CH₃OH

(D) CCl₄ + C₆H₆

Ans :- (B)

Q.12. In which of the following 0.1 M aqueous solution will have lowest freezing point ?

(A) Potassium sulphate

(B) Sodium chloride

(C) Urea

(D) Glucose

Ans :- (A)

Q.13. The osmotic pressure of a 1M solution at 27⁰ C is

(A) 2.46 atm

(B) 24.6 atm

(C) 1.21 atm

(D) 12.1 atm

Ans :- (B)

Q.14. Molal depression constant depends on

(A) Nature of the solute

(B) Nature of the solvent

(C) Vapour pressure of the solution

(D) Heat of the solution

Ans :- (B)

Q.15. The molality of pure water is

(A) 55.6

(B) 50

(C) 100

(D) 18

Ans :- (A)

Q.16. If the degree of dissociation of Na₂SO₄ is α then Vant’ Hoff factor (i) used in the calculation of Molar mass is

(A) 1+α

(B) 1 – α

(C) 1 + 2α

(D) 1 – 2α

Ans :- (C)

Q.17. A 5% solution of came suger (molar mass = 342 ) is isotonic with 1% solution of a substance X . The molar mass of X is

(A) 34.2

(B) 171.2

(C) 68.4


Ans :- (C)

Q.18. The rule that states that the solubility of a gas in a liquid is directly proportinal to the pressure of the gas .

(A) Joule ‘ s law

(B) Boyle’ s law

(C) Henry’ s law

(D) Charle’ s law

Ans :- (C)

Q.19. If the following four chemical are sold at the same rate , then which of the following must be used to create anti freeze solution for car radiator ?


(B) C₂H₅OH

(C) C₂H₄ (OH)₂

(D) C₃H₅ (OH) ₃

Ans :- (A)

Q.20. Which among the following aqueous solution has the highest boilling point ?

(A) 0.01 M urea

(B) 0.01 M KNO₃

(C) 0.01 M Na₂SO₄

(D) 0.015 M glucose

Ans :- (C)

Q.21. The mole fraction of a solute in benzene as solvent is 0.2 . The molality of the solution will be

(A) 14.0

(B) 3.2

(C) 1.4

(D) 2.0

Ans :- (B)

Q.22. A solution has higher osmotic pressure the nits standard solution. Which of the following term will be used for this solution?

(A) Isotonic

(B) Hypertonic

(C) Dilute

(D) Hypotonic

Ans :- (B)

Q.23. Example of an electrolyte is

(A) Sugar

(B) Sodium acetate

(C) urea

(D) benzene

Ans :- (B)

Q.24. At contant temperature the Isotonic solution have the same

(A) Molar concentration

(B) Molality

(C) Normality

(D) None of these

Ans :- (A)

Q.25. Which among the following pair show positive deviation from Roult’s law?

(A) Water- nitricacid

(B) Benzene- Methanol

(C) Water Hydrochloric acid

(D) Acetone Chloroform

Ans :- (B)

Q.26. The Normality of 0.3 M phosphorus acid is

(A) 0.5 N

(B) 0.6 N

(C) 0.9 N

(D) 0.36 N

Ans :- (B)

Q.27. Molality is expressed in

(A) Grams / litre

(B) Litres / Moles

(C) Moles / litre

(D) Moles / Kg

Ans :- (D)

Q.28. Which is not affected by temperature?

(A) Normality

(B) Molality

(C) Molarity

(D) Formality

Ans :- (B)

Q.29. If 2gm of NaOH is present in 200 ml of its solution, its molarity will be

(A) 0.25

(B) 0.5

(C) 5

(D) 10

Ans :- (A)

Q.30. At 25⁰ C, 0.1 M aqueous solution of which among the following substance has high osmotic pressure ?

(A) Glucose

(B) Urea

(C) CaCl₂

(D) KCl

Ans :- (C)

Q.31. Which concentration unit is independent of temperature ?

(A) Molarity

(B) Mass Volume percentage

(C) Molality

(D) Normality

Ans :- (C)

Q.32. Backmann’s thermometer is appropriate for the calculation of

(A) Boiling point

(B) freezing point

(C) difference in temperature

(D) Absolute temperature

Ans :- (C)

Q.33. Boiling point constant of a solution is equal to boiling point, when the molal concentration of dilute solution is

(A) Unity

(B) Zero

(C) More than unity

(D) None of these

Ans :- (A)

Q.34. Atomic mass is equal to

(A) number of electrons of an atom

(B) Sum of the number of electrons and protons of an atom

(C) Sum of the number of neutrons and protons of an atom

(D) None of these

Ans :- (C)

Q.35. 4g of NaOH is dissolved in 250 ml of solution, the Molarity of the solution will be

(A) 1.0

(B) 0.4

(C) 2.0

(D) 0.05

Ans :- (B)

Q.36. The best method for the determination of osmotic pressure is

(A) Morse and Frazer method

(B) preffer method

(C) Berkeley and Hartely method

(D) none of these

Ans :- (C)

Q.37. Saturated solution of NaCl on heating becomes

(A) Supersaturated

(B) Unsaturated

(C) remains saturated

(D) none of these

Ans :- (B)

Q.38. Colligative properties of the sdutions are those properties which depend on

(A) Shapes of the particles

(B) Nature of the soluent

(C) nature of the particles only

(D) number of the particles only

Ans :- (D)

Q.39. Which among the following solution has the lowest freezing point ?

(A) 0.1 m urea

(B) 0.1 m K₄ [ Fe (CN)₆]

(C) 0.1 m K₂ SO₄

(D) 0.1 m NaCl

Ans :- (B)

Q.40. Which of the following is not a colligative property of solution ?

(A) Depression of freezing point

(B) Elevation of Boiling point

(C) Relative lowering of vapour pressure

(D) Optical activity

Ans :- (D)

Q.41. The Molality of solute in solution is expressed in

(A) mol litre ⁻⁴ solution

(B) mol kilogram⁻⁴ solution

(C) mol Kilogram⁻¹ solvent

(D) mol litre⁻⁴ solvent

Ans :- (C)

Q.42. Which of the following will form an ideal solution ?

(A) C₂H₅OH and Water

(B) HNO₃ and water

(C) CHCl₃ and CH₃COCH₃

(D) C₆H₆ and C₆H₅ CH₃

Ans :- (D)

Q.43. Which of the following shows positive deviation from Roult’s law ?

(A) C₆H₆ and C₆H₅CH₃

(B) C₆H₆ and CCl₄

(C) CHCl₃ and C₂H₅OH

(D) CHCl₃ and CH₃COCH₃

Ans :- (C)

Q.44. Which of the following solution pairs can be separated by fractional distillation ?

(A) Water – HNO₃

(B) Water – HCl

(C) Benzene – toluene

(D) C₂H₅OH – water

Ans :- (C)

Q.45. The number of molecules of oxalic acid in 100 ml of 0.02 N oxalic acid solution is

(A) 6.022 × 10²³ molecules

(B) 6 × 10¹⁰ molecules

(C) 6.022 × 10²¹ molecules

(D) 3.011 × 10²⁰ molecules

Ans :- (C)

Q.46. Which among the following is a colligative property

(A) Boiling point

(B) vapour pressure

(C) osmotic pressure

(D) freezing point

Ans :- (C)

Q.47. The van’t haff factor fora solute that associates in solution’s

(A) Zero

(B) more than 1

(C) less than 1

(D) 1.0

Ans :- (C)

Q.48. Increasing the temperature of an aqueous solution will decreases in

(A) molarity

(B) decease in molality

(C) decrease in mole fraction

(D) decrease in % (w/w)

Ans :- (A)

Q.49. During depression in freezing point in a solution, the following are in equilibrium

(A) liquid solvent and solid solvent

(B) liquid solvent and solid solute

(C) liquid solute and solid solute

(D) None is correot

Ans :- (A)

Q.50. Which of the following aqueous solution should have the highest boilling point

(A) 1.0 m NaOH

(B) 1.0 m Na₂SO₄

(C) 1.0 m NH₄NO₃

(D) 1.0 m KnO₃

Ans :- (B)





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