Students of class 12 Chemistry should refer to MCQ Questions Class 12 Chemistry Solutions with answers provided here which is an important chapter in Class 12 Chemistry NCERT textbook. These MCQ for Class 12 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 12 Chemistry examination

Chapter 2 Solutions MCQ with Answers Class 12 Chemistry

MCQ Questions Class 12 Chemistry Solutions provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. A beaker contains a solution of substance ‘A’. Precipitation of substance ‘A’ takes place when small amount of ‘A’ is added to the solution. The solution is ______.
(a) saturated
(b) supersaturated
(c) unsaturated
(d) concentrated

Question. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon __________.
(a) Temperature
(b) Nature of solute
(c) Pressure
(d) Nature of solvent

Question. The vapour pressure of two liquids X and Y are 80 and 60 torr respectively. The total vapour pressure of the ideal solution obtained by mixing 3 moles of X and 2 moles of Y would be
(a) 68 Torr
(b) 140 Torr
(c) 48 Torr
(d) 72 Torr

Question. Which of the following aqueous solutions 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

Question. At what concentration does the solution of ethylene glycol used as an antifreeze?
(a) 35% volume by volume
(b) 35% mass by volume
(c) 35% mass by mass
(d) 35 ppm

Question. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid? 
(a) Sugar crystals in cold water.
(b) Sugar crystals in hot water.
(c) Powdered sugar in cold water.
(d) Powdered sugar in hot water.

Question. At equilibrium the rate of dissolution 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

Question. The value of Henry’s constant KH is _____________. 
(a) greater for gases with higher solubility.
(b) greater for gases with lower solubility.
(c) constant for all gases.
(d) not related to the solubility of gases.

Question. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to ____________. 
(a) low temperature
(b) low atmospheric pressure
(c) high atmospheric pressure
(d) both low temperature and high atmospheric pressure

Question. A solution of chloroform in diethylether:
(a) obeys Raoult’s law
(b) shows a positive deviation from Raoult’s law
(c) shows a negative deviation from Raoult’s law
(d) behaves like a near ideal solution

Question. Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?
(a) Methanol and acetone.
(b) Chloroform and acetone.
(c) Nitric acid and water.
(d) Phenol and aniline.

Question. The system that forms maximum boiling azeotropes is:
(a) ethyl alcohol-water
(b) benzene-toluene
(c) acetone-chloroform
(d) carbon disulphide-acetone

Question. At a given temperature, osmotic pressure of a concentrated solution of a substance _____________.
(a) is higher than that of a dilute solution.
(b) is lower than that of a dilute solution.
(c) is same as that of a dilute solution.
(d) cannot be compared with osmotic pressure of dilute solution.

Question. Mole fraction of the solute in a 1.0 molal aqueous solution is:
(a) 0.1770
(b) 0.0177
(c) 0.0344
(d) 1.7700

Question. Which of the following statements is false? 
(a) Units of atmospheric pressure and osmotic pressure are the same.
(b) In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.
(c) The value of molal depression constant depends on nature of solvent.
(d) Relative lowering of vapour pressure, is a dimensionless quantity.

Question. The values of Van’t Hoff factors for KCl, NaCl and K2SO4, respectively, are _____________.
(a) 2, 2 and 2
(b) 2, 2 and 3
(c) 1, 1 and 2
(d) 1, 1 and 1

Question. The value of van’t Hoff factor for ethanoic acid in benzene is
(a) 1.0
(b) 1.5
(c) 0.5
(d) 2

Question. Osmotic pressure of a solution at a given temperature
(a) increases with concentration
(b) decreases with concentration
(c) remains same
(d) initially increases and then decreases

Question. At 25°C, at 5 % aqueous solution of glucose (molecular weight = 180 g mol–1) is isotonic with a 2% aqueous solution containing an unknown solute. What is the molecular weight of the unknown solute?
(a) 60
(b) 80
(c) 72
(d) 63

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

Question. When a solute is present in trace quantities the following expression is used
(a) Gram per million
(b) Milligram percent
(c) Microgram percent
(d) Parts per million

Question. Which of the following colligative property is used to calculate the molar mass of biomolecules?
(a) Relative lowering of vapour pressure
(b) Elevation in boiling point
(c) Depression in freezing point
(d) Osmotic pressure

Question. One kilogram of sea water sample contains 6 mg of dissolved O2. The concentration of O2 in ppm in the sample is
(a) 0.06
(b) 60
(c) 6
(d) 0.6

Question. 25ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35 ml. The molarity of barium hydroxide solution was
(a) 0.07
(b) 0.14
(c) 0.28
(d) 0.35

Question. Mole fraction of the solute in a 1.00 molal aqueous solution is
(a) 0.1770
(b) 0.0177
(c) 0.0344
(d) 1.7700

Question. What is the normality of a 1 M solution of H3PO4 ?
(a) 0.5 N
(b) 1.0 N
(c) 2.0 N
(d) 3.0 N

Question. Which of the following statements is false? 
(a) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.
(b) The osmotic pressure of a solution is given by the equation p = CRT ( where C is the molarity of the solution).
(c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is BaCl₂ > KCl > CH₃COOH > sucrose.
(d) According to Raoult’s law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.

Question. The vapour pressure of pure benzene and toluene at a particular temperature are 100 mm and 50 mm respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is
(a) 0.67
(b) 0.75
(c) 0.33
(d) 0.50

Question. Which of the following liquid pairs shows a positive deviation from Raoult’s law ?
(a) Water – Nitric acid
(b) Benzene – Methanol
(c) Water – Hydrochloric acid
(d) Acetone – Chloroform

Question. Which of the following concentration unit is independent of temperature ?
(a) Normality
(b) Molarity
(c) Formality
(d) Molality

Question. 10 g of NaCl is dissolved in 106g of the solution. Its concentration is
(a) 100 ppm
(b) 0.1 ppm
(c) 1 ppm
(d) 10 ppm

Question. Which of the following is not a colligative property ?
(a) Optical activity
(b) Osmotic pressure
(c) Depression of freezing point
(d) Elevation of boiling point

Question. If 0.1 M solutions of each electrolyte are taken and if all electrolytes are completely dissociated, then whose boiling point will be highest ? 
(a) Glucose
(b) KCl
(c) BaCl₂
(d) K₄ [Fe(CN)₆ ]

Question. MX 2 dissociates into M 2+ and X – ions in an aqueous solution with a degree of dissociation (ex.) of 0.5. The ratio of observed depression of freezing point of the aqueous solution to the value of the depression of freezing point in the absence of ionic dissociation. 
(a) 1
(b) 2
(c) 3
(d) 4   

Question. Which one of the following is not correct for an ideal solution ? 
(a) It must obey Raoult’s law
(b) ΔH = 0
(c) ΔV = O
(d) ΔH = ΔV ≠ 0         

Question. If in a solvent, n simple molecules of solute combine to form an associated molecule, ex. is the degree of association, the van ‘t Hoff factor is equal to
(a) 1 / 1 – nα
(b) 1 – α + nα
(c) 1 – α + α / n
(d) α / n – 1 + α       

Question. A 2.0 molal sugar solution bas approximately the same freezing point as a 1.0 molal solution of 
(a) CaCI₂
(b) CH₃COOH
(c) C₂H₅OH
(d) NaCl       

Question. The degree of dissociation (α)ofa weak electrolyte, A_xB_Y is related to van’t Hoff factor (i) by the expression
(a) α = i – 1 / (x + y – 1)
(b) α = i – 1 / x + y + 1
(c) α = x + y – 1 / i – 1 
(d) α = x + y + 1 / i – 1       

Question. If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water ( ΔT_f ), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is (K_f = 1.86 K kg mol^-1) 
(a) 0.0372 K
(b) 0.0558 K
(c) 0.0744 L
(d) 0.0186 K         

Question. van ‘t Hoff factor of aq. K₂SO₄ at infinite dilution bas value equal to 
(a) 1
(b) 2
(c) 3
(d) between 2 and 3         

Question. If the various terms in the below given expressions have usual meanings, the van ‘t Hoff factor (i) cannot be calculated by which one of the expressions ? 
(a) πV = ✓inRT
(b) ΔT_f = ik_f .m
(c) ΔT_b = ik_b.m
(d) P_solvent – P_solution / P_solution  = i (n/N+n)     

Question. The increase in boiling point of a solution containing 0.6 g urea in 200 g water is 0.50°C. Find the molal elevation constant.
(a) 10Kkgmol^-1
(b) 10Kgmol^-1
(c) 10 K kg mol
(d) 1.0 K kg mol^-1

Question. The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C₆H₁₂O₆ ) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be
(a) 17.675 mmHg
(c) 16.500 mmHg
(b) 15.750 mmHg 
(d) 17.325 mmHg

Question. The osmotic pressure is expressed in the units of 
(a) MeV
(b) cal
(c) emfs
(d) atm

Question. Which of the following would exert maximum osmotic pressure ? 
(a) Decinormal aluminium sulphate
(b) Decinormal barium chloride
(c) Decinormal sodium chloride
(d) A solution obtained by mixing equal voltunes of (b) and (c) and filtering

Question. What is the freezing point of a solution containing 8.1 g HBr in 100 g water assuming the acid to be 90% ionised? (K_f for wt = 1.86 K mol^-1) 
(a) 0.85°C
(b) – 3.53°C
(c) 0°C
(d) – 0.35°C

Question. The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and non-electrolyte solid weighing 2.175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 600 mm of Hg, what is the molecular weight of solid substance ? 
(a) 49.50
(b) 59.60
(c) 69.60
(d) 79.82

Question. Which of the following solutions will have highest boiling point ? 
(a) 0.1 M FeCl₃
(b) 0.1 M BaCl₂
(c) 0.1 M NaCl
(d) 0.1 M urea (NH₂CONH₂ )

Question. When 25 g of a non-volatile solute is dissolved in 100 g of water, the vapour pressure is lowered by 2. 25 x 10^-1 mm. If the vapour pressure of water at 20°C is 17. 5 mm, what is the molecular weight of the solute ?
(a) 206
(b) 302
(c) 350
(d) 276

Question. Solutions A, B, C and Dare respectively 0.1 M glucose, 0.05 M NaCl, 0.05 M BaCl₂ and 0.1 M AlCl₃ . Which one of the following pairs is isotonic ?
(a) AandB
(b) BandC
(c) A and D
(d) A and C

Question. Consider the following aqueous solutions and assume 100% ionisation in electrolytes
I. 0.1 m urea
II. 0.04 m Al₂(SO₄ )₃
III. 0.05 m CaCl₂
IV. 0.005 m NaCl
The correct statement regarding the above solution is
(a) freezing point will be lowest for solution I 
(b) freezing point will be highest for solution IV
(c) boiling point will be highest for solution IV
(d) vapour pressure will be highest for solution II

Question. Maximum lowering of vapour pressure is observed in the case of
(a) 0.1 M glucose
(b) 0. 1 M BaCl₂
(c) 0.1 M MgSO₄
(d) 0.1 NaCl

Question. The freezing point of 1 % solution of lead nitrate in water will be
(a) 2°C
(b) 1°C
(c) 0°C
(d) below 0°C

Question. Which is not a colligative property in the following?
(a) pH of a buffer solution 
(b) Boiling point elevation
(c) Freezing point depression
(d) Vapour pressure lowering

Question. Which of the following can be measured by the Ostwald-Walker dynamic method? 
(a) Relative lowering of vapour pressure
(b) Lowering of vapour pressure
(c) Vapour pressure of the solvent
(d) All of the above

Question. The freezing point of water is depressed by 0.37°C in a 0.01 mo! NaCl solution. The freezing point of 0.02 molal solution of urea is depressed by 
(a) 0.37°C
(b) 0.74°C
(c) 0.185°C
(d) 0°C

Question. On adding 1 g arsenic to 80 g benzene, the freezing point of benzene is lowered by 0.19°C. The formula of arsenic is (K_f = 5.08 K kg mol^-1)
(a) As
(b) As₂
(c) As₃
(d) As₄

Question. The osmotic pressure (at 27°C) of an aqueous solution (200 mL) containing 6 g of a protein is 2 x 10^-3 atm. If R = 0. 080 L atm mol^-1 K^-1 , the molecular weight of protein is 
(a) 7.2 x 10⁵
(b) 3.6 x 10⁵
(c) 1.8x 10⁵
(d) 1.Ox 10⁵

Question. Osmotic pressure of a solution at a given temperature
(a) increases with concentration 
(b) decreases with concentration
(c) remains same
(d) initially increases and then decreases

Question. On adding a solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is
(a) 0.25
(b) 0.75
(c) 0.50
(d) 0.33

Question. An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because _____________. 
(a) it gains water due to osmosis.
(b) it loses water due to reverse osmosis.
(c) it gains water due to reverse osmosis.
(d) it loses water due to osmosis.

Question. The azeotropic mixture of water (b.p.100°C) and HCl (b.p.85°C) boils at 108.5°C. When this mixture is distilled it is possible to obtain
(a) pure HCl
(b) pure water
(c) pure water as well as pure HCl
(d) neither HCl nor H₂O in their pure states

Question. Which one of the following is a colligative property ?
(a) Boiling point
(b) Vapour pressure
(c) Osmotic pressure
(d) Freezing point

Question. Blood cells retain their normal shape in solution which are
(a) hypotonic to blood
(b) isotonic to blood
(c) hypertonic to blood
(d) equinormal to blood.

Question. Which of the following concentration terms is/are independent of temperature?
(a) Molality only
(b) Molality and mole fraction
(c) Molarity and mole fraction
(d) Molality and normality

Question. A solution is prepared by dissolving 10 g NaOH in 1250 mL of a solvent of density 0.8 mL/g. The molality of the solution in mol kg–1 is
(a) 0.25
(b) 0.2
(c) 0.008
(d) 0.0064

Question. 12 g of a nonvolatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is
(a) 80
(b) 60
(c) 20
(d) 40

Question. The system that forms maximum boiling azeotrope is
(a) carbondisulphide – acetone
(b) benzene – toluene
(c) acetone – chloroform
(d) n-hexane – n-heptane

Question. As a result of osmosis, the volume of more concentrated solution
(a) gradually decreases
(b) gradually increases
(c) is not affected
(d) suddenly increases

Question. A solution made by dissolving 40 g NaOH in 1000 g of water is
(a) 1 molar
(b) 1 normal
(c) 1 molal
(d) None of these

Question. The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be
(a) 17.325 mm Hg
(b) 15.750 mm Hg
(c) 16.500 mm Hg
(d) 17.500 mm Hg

Question. The amount of solute (molar mass 60 g.mol–1) that must be added to 180 g of water so that the vapour pressure of water is lowered by 10% is
(a) 30 g
(b) 60 g
(c) 120 g
(d) 12 g

Question. A solution of acetone in ethanol
(a) shows a positive deviation from Raoult’s law
(b) behaves like a non ideal solution
(c) obeys Raoult’s law
(d) shows a negative deviation from Raoult’s law

Question. The value of P° for benzene is 640 mm of Hg. The vapour pressure of solution containing 2.5gm substance in 39gm. benzene is 600mm of Hg the molecular mass of X is
(a) 65.25
(b) 130
(c) 40
(d) 75

Question. The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of a non-volatile solute and 0.8 mol of solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature is
(a) 150 mm of Hg
(b) 60 mm of Hg
(c) 75 mm of Hg
(d) 120 mm of Hg

Question. Negative deviation from Raoult’s law is observed in which one of the following binary liquid mixtures?
(a) Ethanol and acetone
(b) Benzene and toluene
(c) Acetone and chloroform
(d) Chloroethane and bromoethane

Question. A mixture of two completely miscible non-ideal liquids which distill as such without change in its composition at a constant temperature as though it were a pure liquid. This mixture is known as
(a) binary liquid mixture
(b) azeotropic mixture
(c) eutectic mixture
(d) ideal mixture

Question. Isotonic solutions have same
(a) molar concentration
(b) molality
(c) normality
(d) None of these

Question. If we place the blood cells in a solution containing less than 0.9% (m/V) sodium chloride. They would swell. This is because
(a) the solution is hypotonic
(b) the solution is isotonic
(c) the solution is hypertonic
(d) none of these

Question. Which of the following factor do not affect solubility of solid solute in liquid ?
(a) Temperature
(b) Pressure
(c) Nature of solute
(d) All of these

Question. At equillibrium the rate of dissolution 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

Question2. In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is _____________.
(a) the same
(b) about twice
(c) about three times
(d) about six times

We hope the above multiple choice questions for Class 12 Chemistry for Chapter 2 Solutions provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Solutions is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.