Class 12 Chemistry MCQs Solutions for JEE/NEET

Here, you will get Class 12 Chemistry MCQ of Chapter 2 Solutions for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Chemistry Chapter 2 Solutions, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. 

Solutions 12 MCQs Questions with Answers

Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of 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: (b) 50

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) Mole fraction

A plant cell shrinks when it is kept in a
(a) hypotonic solution
(b) hypertonic solution
(c) isotonic solution
(d) pure water

Answer: (b) hypertonic solution

Which of the following is a quantitative description of the solution?
(a) Dilute
(b) Concentrated
(c) Saturated
(d) Molar

Answer: (d) Molar

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: (b) Henry’s law

Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are
(a) M, m
(b) F, x
(c) m, x
(d) M, x

Answer: (c) m, x

Which of the following condition is not satisfied by an ideal solution?
(a) ΔHmixing = 0
(b) ΔVmixing = 0
(c) Raoult’s Law is obeyed
(d) Formation of an azeotropic mixture

Answer: (d) Formation of an azeotropic mixture

Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be
(a) 0.33
(b) 0.666
(c) 0.3 × 10-2
(d) 3

Answer: (c) 0.3 × 10-2

Which has the lowest boiling point at 1 atm pressure?
(a) 0.1 M KCl
(b) 0.1 M Urea
(c) 0.1 M CaCl2
(d) 0.1 M A1Cl3

Answer: (b) 0.1 M Urea

Isotonic solution are the solutions having the same
(a) surface tension
(b) concentration
(c) osmotic pressure
(d) viscosity

Answer: (c) osmotic pressure

Which of the following 0.1 M aqueous solutions will have the lowest freezing point?
(a) potassium sulphate
(b) sodium chloride
(c) urea
(d) glucose

Answer: (a) potassium sulphate

The mass of (COOH)2. 2H2O needed to prepare 500 ml of 0.1 molar solution is
(a) 12.6 gm
(b) 6.3 gm
(c) 4.5 gm
(d) 9.0 gm

Answer: (b) 6.3 gm

Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl solutions are mixed. The concentration of NO3 ions in mixture solution will be
(a) 0.1 M
(b) 0.05 M
(c) 0.2 M
(d) 0.15 M

Answer: (b) 0.05 M

The solution containing 6.8 g of non-ionic solute in 100 g of water was found to freeze at -0.93°C. If Kf for water is 1.86, the mol. mass of solute is
(a) 13.6
(b) 68
(c) 34
(d) 136

Answer: (d) 136

Which of the following salt will have same value of Vant Hoff’s factor (i) as that of K4[Fe (CN)6]
(a) Al2(SO4)3
(b) NaCl
(c) Al(NO3)3
(d) Na2SO4

Answer: (a) Al2(SO4)3

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) 0.5

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: (d) 282 bar

Among the following substances the lowest vapour pressure is exerted by
(a) water
(b) alcohol
(c) ether
(d) mercury

Answer: (d) mercury

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: (c) 72 torr

The system that forms maximum boilingazetrope is
(a) Acetone-chloroform
(b) ethanol-acetone
(c) n-hexane-n-heptane
(d) carbon disulphide-acetone

Answer: (a) Acetone-chloroform

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: (c) solute molecules to the total number of molecules in solution

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: (b) depression in freezing point of snow

The atmospheric pollution is generally measured in the units of
(a) mass percentage
(b) volume percentage
(c) volume fraction
(d) ppm

Answer: (d) ppm

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: (a) 1.78 × 10-3

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: (d) 2.24 mg

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