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ISC Class 12 Solutions — practice questions

Explore 50 free Solutions questions in ISC Class 12 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Solutions questions and exercises with answers

Showing questions 1–30 of 50.

A solution is described as 10% glucose in water by mass. The mass of water present in 100 g of this solution is:Read the answer and worked solution →Which of the following concentration terms is dependent on temperature?Read the answer and worked solution →Molality of a solution is defined as the number of moles of solute per:Read the answer and worked solution →A solution contains 20% of ethylene glycol (C2H6O2, molar mass 62 g/mol) by mass in water. Taking 100 g of solution, the mole fraction of ethylene glycol is:Read the answer and worked solution →Calculate the molarity of a solution containing 5 g of NaOH (molar mass 40 g/mol) in 450 mL of solution.Read the answer and worked solution →Calculate the molality of a solution of 2.5 g of ethanoic acid (CH3COOH, molar mass 60 g/mol) in 75 g of benzene.Read the answer and worked solution →Henry's law for the dissolution of a gas in a liquid is most commonly expressed as:Read the answer and worked solution →Scuba divers breathing air at high pressure underwater may suffer from 'bends' on ascending. The gas chiefly responsible for the bubbles that block capillaries is:Read the answer and worked solution →For a binary solution of two volatile liquids 1 and 2, Raoult's law gives the partial vapour pressure of component 1 as:Read the answer and worked solution →For an ideal solution, the enthalpy of mixing and the volume of mixing of the pure components are respectively:Read the answer and worked solution →A liquid mixture that shows a large positive deviation from Raoult's law will form which kind of azeotrope?Read the answer and worked solution →Which of the following is NOT a colligative property of a solution?Read the answer and worked solution →The elevation of boiling point of a dilute solution is given by which expression, where m is molality and Kb the molal elevation constant?Read the answer and worked solution →The depression of freezing point of a dilute solution is directly proportional to which quantity?Read the answer and worked solution →45 g of ethylene glycol (molar mass 62 g/mol) is mixed with 600 g of water (Kf = 1.86 K kg/mol). The depression in freezing point is approximately:Read the answer and worked solution →1.00 g of a non-electrolyte dissolved in 50 g of benzene lowers its freezing point by 0.40 K. Given Kf = 5.12 K kg/mol for benzene, the molar mass of the solute is:Read the answer and worked solution →The osmotic pressure of a dilute solution is related to its molarity C and temperature T (R = gas constant) by:Read the answer and worked solution →Two solutions that have the same osmotic pressure at a given temperature are described as:Read the answer and worked solution →A red blood cell placed in a solution containing more than 0.9% (mass/volume) sodium chloride will:Read the answer and worked solution →The van't Hoff factor i is defined as the ratio of:Read the answer and worked solution →For a solute that dissociates in solution and one that associates, the van't Hoff factor i is respectively:Read the answer and worked solution →If 1 mol of KCl is dissolved in 1 kg of water and full dissociation is assumed (i = 2), the expected elevation of boiling point is (Kb for water = 0.52 K kg/mol):Read the answer and worked solution →For a weak acid HA that dissociates into one H+ and one A- ion, if the van't Hoff factor is 1.041, the degree of dissociation x is:Read the answer and worked solution →At a given dilution, the van't Hoff factor i for complete dissociation approaches which value for K2SO4 in water?Read the answer and worked solution →Higher or Lower: Solutions (ISC 12)Read the answer and worked solution →HENRY'S LAW states that at constant temperature:Read the answer and worked solution →Salt is sprinkled on icy roads in cold countries to:Read the answer and worked solution →Two are true, one is notRead the answer and worked solution →True or false: concentrationRead the answer and worked solution →Complete the meaning of colligativeRead the answer and worked solution →

Worked practice questions

A solution is described as 10% glucose in water by mass. The mass of water present in 100 g of this solution is:

  1. 100 g
  2. 90 g
  3. 10 g
  4. 80 g
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Correct answer: B. 90 g

1. Mass % of a component = (mass of component / total mass of solution) $\times$ 100. 2. 10% glucose by mass means 10 g glucose is present in 100 g of solution. 3. Mass of water = total mass $-$ mass of glucose = $100 - 10 = 90$ g. _Source: syllabus Chemistry Ch 1 "Solutions", p.2_

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Which of the following concentration terms is dependent on temperature?

  1. Molarity
  2. Mole fraction
  3. Molality
  4. Mass percentage
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Correct answer: A. Molarity

1. Mass %, ppm, mole fraction and molality are all defined using masses or mole counts, which do not change with temperature. 2. Molarity is moles of solute per litre of solution, and volume of solution expands or contracts with temperature. 3. Hence molarity is a function of temperature, while the others are temperature independent. _Source: syllabus Chemistry Ch 1 "Solutions", p.4_

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Molality of a solution is defined as the number of moles of solute per:

  1. litre of solvent
  2. litre of solution
  3. kilogram of solution
  4. kilogram of solvent
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Correct answer: D. kilogram of solvent

1. Molality (m) = moles of solute / mass of solvent in kg. 2. Molarity uses volume of solution in litres, so option A describes molarity, not molality. 3. The defining mass is that of the solvent (not the solution), so molality is moles of solute per kilogram of solvent. _Source: syllabus Chemistry Ch 1 "Solutions", p.4_

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