Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 2 Solutions with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have provided Solutions Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.
Solutions Class 12 MCQs Questions with Answers
Solutions Class 12 MCQ Question 1.
If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be
(a) 0.25
(b) 0.5
(c) 5
(d) 10
Answer
Answer: (a) 0.25
MCQ On Solutions Class 12 Question 2.
The atmospheric pollution is generally measured in the units of
(a) mass percentage
(b) volume percentage
(c) volume fraction
(d) ppm
Answer
Answer: (d) ppm
Solution MCQ Class 12 Question 3.
A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is
(a) 342
(b) 171.2
(c) 68.4
(d) 136.8
Answer
Answer: (c) 68.4
Class 12 Chemistry Chapter 2 MCQ Question 4.
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
Answer: (b) 0.5
MCQ Of Chapter 2 Chemistry Class 12 Question 5.
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
Answer: (d) 282 bar
Class 12 Chemistry Chapter 2 MCQs Question 6.
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
Answer: (b) sum of the numbers of electrons and protons of an atom
MCQ Questions For Class 12 Chemistry Chapter 2 Question 7.
Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane is nenzene at 298 K under 760 mm Hg is
(a) 1.78 × 10-3
(b) 17.43
(c) 0.114
(d) 2.814
Answer
Answer: (a) 1.78 × 10-3
Class 12 Solutions MCQ Question 8.
How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10-3 mol/L/atm?
(a) 22.4 mg
(b) 22.4 g
(c) 2.24 g
(d) 2.24 mg
Answer
Answer: (d) 2.24 mg
MCQ Solutions Class 12 Question 9.
The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
(a) Raoult’s law
(b) Henry’s law
(c) Lowering of vapour pressure
(d) Van’t Hoff law
Answer
Answer: (b) Henry’s law
MCQ Of Solution Chapter Question 10.
Among the following substances the lowest vapour pressure is exerted by
(a) water
(b) alcohol
(c) ether
(d) mercury
Answer
Answer: (d) mercury
MCQ On Solution Chapter Class 12 Question 11.
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
Answer
Answer: (b) 50
Chapter 2 Chemistry Class 12 MCQ Question 12.
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
Answer
Answer: (b) Raoult’s law
Solution Class 12 MCQ Question 13.
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
Answer
Answer: (c) 72 torr
Solutions Chemistry Class 12 MCQ Question 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 + Benzene
Answer
Answer: (b) Acetone + Ethanol
MCQ Questions On Solutions In Chemistry Class 12 Question 15.
The system that forms maximum boilingazetrope is
(a) Acetone-chloroform
(b) ethanol-acetone
(c) n-hexane-n-heptane
(d) carbon disulphide-acetone
Answer
Answer: (a) Acetone-chloroform
Question 16.
A plant cell shrinks when it is kept in a
(a) hypotonic solution
(b) hypertonic solution
(c) isotonic solution
(d) pure water
Answer
Answer: (b) hypertonic solution
Question 17.
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
Answer
Answer: (c) solute molecules to the total number of molecules in solution
Question 18.
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
Answer
Answer: (a) 91.8 g
Question 19.
What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
(a) 496 g
(b) 297 g
(c) 310 g
(d) 426 g
Answer
Answer: (b) 297 g
Question 20.
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
Answer: (b) increasing the number of solute molecules
Question 21.
Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is
(a) lowering in vapour pressure of snow
(b) depression in freezing point of snow
(c) melting of ice due to increase in temperature by putting salt
(d) increase in freezing point of snow
Answer
Answer: (b) depression in freezing point of snow
Question 22.
For carrying reverse osmosis for desalination of water the material used for making semipermeable membrane is
(a) potassium nitrate
(b) parchment membrane
(c) cellulose acetate
(d) cell membrane
Answer
Answer: (c) cellulose acetate
Question 23.
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
Answer: (b) 87%
Question 24.
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
Answer: (a) Mole fraction
Question 25.
At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is
(a) less than the rate of crystallisation
(b) greater than the rate of crystallisation
(c) equal to the rate of crystallisation
(d) zero
Answer
Answer: (c) equal to the rate of crystallisation
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