CBSE Class 12 Solutions Multiple Choice Questions with Answers. MCQ Questions Class 12 Solutions with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Solutions MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Solutions with Answers - Set - 4
Question 1:
A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
(a) 91.8 g
(b) 1198 g
(c) 83.9 g
(d) 890.3 g
Correct Answer – (A)
Question 2 :
A plant cell shrinks when it is kept in a
(a) hypotonic solution
(b) hypertonic solution
(c) isotonic solution
(d) pure water
Correct Answer – (B)
Question 3 :
Which of the following solutions shows positive deviation from Raoult’s law?
(a) Acetone + Aniline
(b) Acetone + Ethanol
(c) Water + Nitric acid
(d) Chloroform + Benzene
Correct Answer – (B)
Question 4 :
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) Ostawald’s dilution law
Correct Answer – (B)
Question 5 :
Among the following substances the lowest vapour pressure is exerted by
(a) water
(b) alcohol
(c) ether
(d) mercury
Correct Answer – (D)
MCQ Questions Class 12 Solutions with Answers
Question 6 :
The relative lowering in vapour pressure is proportional to the ratio of number of
(a) solute molecules to solvent molecules
(b) solvent molecules to solute molecules
(c) solute molecules to the total number of molecules in solution
(d) solvent molecules to the total number of molecules in solution
Correct Answer – (C)
Question 7 :
The system that forms maximum boilingazetrope is
(a) Acetone-chloroform
(b) ethanol-acetone
(c) n-hexane-n-heptane
(d) carbon disulphide-acetone
Correct Answer – (A)
Question 8 :
3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
(a) 80 torr
(b) 140 torr
(c) 72 torr
(d) 70 torr
Correct Answer – (C)
Question 9 :
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
(a) 20
(b) 50
(c) 100
(d) 200
Correct Answer – (B)
Question 10 :
The law which indicates the relation’-hip between solubility of a gas in liquid and pressure
(a) Raoult’s law
(b) Henry’s law
(c) Lowering of vapour pressure
(d) Van’t Hoff law
Correct Answer – (B)
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