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Solutions are an important part of Chemistry in Class 12 and are commonly asked in board exams and competitive tests like JEE and NEET. This chapter helps students understand how substances mix to form solutions and the factors affecting their behavior. Mastering this topic is essential, as it lays the foundation for concepts in both physical and organic chemistry.
The “Solutions” chapter covers topics like types of solutions, concentration terms (molarity, molality, mole fraction), solubility, Raoult’s law, colligative properties, and their applications. These concepts are not only theoretical but also have practical relevance in everyday life, such as understanding how salt dissolves in water or why antifreeze is added to car engines in cold weather. The chapter also explains advanced concepts like ideal and non-ideal solutions, azeotropes, and the van ‘t Hoff factor, making it both interesting and challenging.
Multiple-choice questions (MCQs) are an excellent way to test your understanding of this chapter. They help in revising key concepts, practicing numerical problems, and improving time management for exams. MCQs also train you to analyze problems quickly and choose the correct answer from multiple options, which is a critical skill for competitive exams.
This set of Chemistry Class 12 MCQs on Solutions is designed to help you prepare effectively. The questions cover all major topics and include a mix of theoretical, conceptual, and numerical problems. By practicing these MCQs, you can strengthen your basics, clear doubts, and build confidence in solving different types of problems.
Whether you are revising for board exams or preparing for entrance tests, these MCQs will serve as a helpful resource. They are framed in a way to challenge your understanding and application of concepts, making your preparation more robust and exam-ready. With regular practice, you can identify your weak areas, improve accuracy, and boost your overall performance.
So, dive into these Chemistry Class 12 MCQs on Solutions and take one step closer to mastering the chapter. Remember, consistent practice is the key to scoring high marks in exams!
Solutions Class 12 Chemistry MCQs
MCQ on Solutions and Colligative Properties
What happens when two ideal solutions with volume
each are mixed?
a) Volume becomes
b) Volume decreases
c) Volume increases
d) No change in volume
Answer: a) Volume becomes
Which property depends only on the number of solute particles in a solution, not their nature?
a) Depression in freezing point
b) Molal elevation constant
d) Lowering of vapor pressure
Answer: a) Depression in freezing point
Which among the following is not a colligative property?
a) Molality
b) Osmotic pressure
c) Depression in freezing point
d) Elevation in boiling point
Answer: a) Molality
What type of interaction exists between n-Hexane and n-Octane molecules?
a) Ion-dipole interaction
b) London dispersion forces
c) Hydrogen bonding
d) Dipole-dipole interaction
Answer: b) London dispersion forces
Do Check: NCERT Solutions for Class 12 Chemistry Chapter 2 Solutions
What happens when a solute crystal is added to a supersaturated solution?
a) The solution becomes saturated
b) Solute dissolves further
c) Solute precipitates out
d) The solution becomes unstable
Answer: c) Solute precipitates out
MCQ on Henry’s Law and Gas Solubility
The Henry’s law constant
is larger for gases that are:
a) Highly soluble
b) Sparingly soluble
c) Independent of solubility
d) Non-reactive
Answer: b) Sparingly soluble
Arrange the following gases in increasing order of solubility: Ar (), CO2 (), CH4 (), HCHO (
).
a) Ar < CO2 < CH4 < HCHO
b) HCHO < CH4 < CO2 < Ar
c) Ar < CH4 < CO2 < HCHO
d) HCHO < CO2 < CH4 < Ar
Answer: a) Ar < CO2 < CH4 < HCHO
MCQ on Freezing Point, Boiling Point, and Vapor Pressure
In comparison to a 0.01 M glucose solution, the depression in freezing point of a 0.01 M solution is:
a) Same
b) About twice
c) About three times
d) About six times
Answer: b) About twice
Which solution has the highest boiling point?
a) 1.0 M NaCl
b) 1.0 M Na2SO4
c) 1.0 M Glucose
d) 1.0 M Urea
Answer: b) 1.0 M Na2SO4
What is the relative lowering of vapor pressure when 12g of urea and 68.4g of sucrose are dissolved in 1L of water?
a) Higher for urea
b) Higher for sucrose
c) Equal for both
d) Depends on temperature
Answer: c) Equal for both
MCQ on Van’t Hoff Factor and Degree of Dissociation
If a solute undergoes dimerization and its Van’t Hoff factor is 0.6, the degree of dimerization is:
a) 20%
b) 50%
c) 80%
d) 60%
Answer: c) 80%
Do Check: Chemistry MCQs for Class 12 with Answers Chapter 2 Solutions
MCQ on Molarity, Molality, and Concentration
The molality of a 2.05 M acetic acid solution with a density of 1.02 g/mL is:
a) 3.28 mol/kg
b) 2.28 mol/kg
c) 0.44 mol/kg
d) 1.14 mol/kg
Answer: b) 2.28 mol/kg
Which of the following is affected by temperature?
a) Molarity
b) Molality
c) Mass percentage
d) Mole fraction
Answer: a) Molarity
MCQ on Osmotic Pressure
The osmotic pressure of a solution at 300K is 0.0821 atm. The concentration of the solution in moles per liter is:
a) 0.33
b) 0.666
c) 0.0033
d) 3
Answer: c) 0.0033
MCQ on Ideal and Non-Ideal Solutions
Which type of solution follows Raoult’s law at all concentrations?
a) Ideal solution
b) Non-ideal solution
c) Real solution
d) Dilute solution
Answer: a) Ideal solution
When two perfect solutions are mixed, the resulting heat change is:
a) Positive
b) Negative
c) Zero
d) Cannot be determined
Answer: c) Zero
MCQ on Colligative Properties Applications
Which property increases with the addition of a non-volatile solute?
a) Vapor pressure
b) Freezing point
c) Osmotic pressure
d) Solvent density
Answer: c) Osmotic pressure
Which of the following solutions forms a maximum boiling azeotrope?
a) Acetone–Chloroform
b) Benzene–Toluene
c) Carbon disulphide–Acetone
d) Ethanol–Water
Answer: a) Acetone–Chloroform
Miscellaneous MCQ on Class 12 Solutions
What makes up a solution?
a) Solute and solvent
b) Solvent and solvent
c) Solute and solute
d) None of the above
Answer: a) Solute and solvent
Do Check: Solutions Class 12 Notes Chemistry Chapter 2
What is the type of solution where a solid dissolves in a gas?
a) Solid in liquid
b) Solid in gas
c) Gas in gas
d) Liquid in gas
Answer: b) Solid in gas
What happens to an unripe mango in concentrated salt water?
a) Gains water due to osmosis
b) Loses water due to osmosis
c) Gains water due to reverse osmosis
d) No change occurs
Answer: b) Loses water due to osmosis
Which among the following is not an example of a solid solution?
a) Brass
b) Bronze
c) Hydrated salts
d) Aerated drinks
Answer: d) Aerated drinks
The pressure of a single gas in a mixture is called:
a) Total pressure
b) Absolute pressure
c) Partial pressure
d) None of the above
Answer: c) Partial pressure
What is the heat change when solutes dissolve in ideal solutions?
a) Positive
b) Negative
c) Zero
d) Cannot be determined
Answer: c) Zero
Which intermolecular force is the weakest?
b) London dispersion forces
c) Ion-dipole interaction
d) Dipole-dipole interaction
Answer: b) London dispersion forces
