Chemistry Chapter Wise Important Questions for CBSE Board Exam 2022-2023

Chapter : Solution

Multiple-choice questions – 1 mark each

1. The solubility of a substance in a solvent depends on the?
   a) Temperature
   b) Nature of solute and solvent
   c) Pressure
   d) All the above
2. Which law explained the solubility of gasses in a liquid?
   a) Boyle’s law
   b) Charles’s law
   c) Henry’s law
   d) Raoult’s law
3. Isotonic solutions are the solutions having the same.
   a) osmotic pressure
   b) surface tension
   c) concentration
   d) Temperature
4. The law stating that the relative lowering of vapor pressure is equal to
   the mole fraction of a solute in the solution is known as
   a) Henry’s law
   b) Raoult’s law
5. A plant cell shrinks when it is kept in
   a) Hypotonic solution
   b) Isotonic solution
   c) Hypertonic solution
   d) Pure water

Very short answer type questions – 2 marks each

1. What is meant by ‘reverse osmosis?
2. What are ‘azeotropes?
3. What are defined colligative properties?
4. What type of intermolecular attractive interaction exists in the pair of
   methanol and acetone?
5. Define the ‘mole fraction’ of a substance in a solution.

Short answer type questions – 3 marks each

1. Calculate the mass percentage of benzene (C6H6) and carbon
   tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of carbon
   tetrachloride.
2. Calculate the mole fraction of ethanol and water in a sample of
   rectified spirit which contains 46% ethanol by mass.
3. What is the relationship between the relative lowering of vapour
   pressure and mole fraction of solute?
4. State Raoult’s law. How is it formulated for solutions of non-volatile
   solutes?
5. State Henry’s law. What is the effect of temperature on the solubility
   of a gas in a liquid?

Long answer type questions – 5 marks each

1. a) Define the following terms :
   (i) Mole fraction (ii) Van’t Hoff factor
   b) Differentiate between molarity and molality for a solution.
   c) Define the terms osmosis and osmotic pressure.
2. State the following :
   (i) Henry’s law about partial pressure of a gas in a mixture.
   (ii) Raoult’s law in its general form in reference to solutions.
   (b) A solution prepared by dissolving 8.95 mg of a gene fragment in
   35.0 mL of water has an osmotic pressure of 0.335 torrs at 25°C. Assuming the gene fragment is a non-electrolyte, determine its molar masses.
3. H2s, a toxic gas with a rotten egg-like smell, are used for the qualitative analysis. If the solubility of H2s in water at STP is 0.195 m, calculate Henry’s law constant.
4. The vapour pressure of pure liquids A and B are 450 and 700 mm Hg
   respectively, at 350 K. Find out the composition of the liquid mixture if
   the total vapour pressure is 600 mm Hg. Also, find the composition of
   the vapour phase.
5. (a) Define the following terms: ..
   (i) Ideal solution (ii) Azeotrope (iii) Osmotic pressure
   (b) A solution of glucose (C6H1206) in water is labelled as 10% by
   weight. What would be the molality of the solution?
   (Molar mass of glucose = 180 g mol-1