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JEE Main Unit 3B2: Solubility Equilibria and Mixtures — practice questions

Explore 14 free Unit 3B2: Solubility Equilibria and Mixtures questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 3B2: Solubility Equilibria and Mixtures questions and exercises with answers

Showing questions 1–14 of 14.

The mole fraction of ethylene glycol in a 20 % (w/w) aqueous solution (molar masses: glycol 62, water 18) is closest toRead the answer and worked solution →5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The molarity is closest toRead the answer and worked solution →Which of the following concentration units of a solution is temperature-dependent?Read the answer and worked solution →Molality of a solution containing 2.5 g of ethanoic acid (CH₃COOH, M = 60 g/mol) in 75 g of benzene is closest toRead the answer and worked solution →Henry law states that the partial pressure of a gas in solution isRead the answer and worked solution →For a solution of a non-volatile solute, Raoult law implies that the vapour pressure of the pure solventRead the answer and worked solution →For an ideal binary liquid solution, Raoult law gives the total vapour pressure asRead the answer and worked solution →If a solute dimerises in solution, its observed molar mass compared with the calculated value will beRead the answer and worked solution →A negative deviation from Raoult law is expected whenRead the answer and worked solution →Van't Hoff factor i > 1 for a solute indicatesRead the answer and worked solution →Osmotic pressure π of a dilute solution obeys π = C R T. Here C representsRead the answer and worked solution →The molality of a 1 M aqueous NaCl solution (density = 1.04 g/mL, NaCl M = 58.5 g/mol) is closest toRead the answer and worked solution →Which of these solutions will boil at the highest temperature at 1 atm?Read the answer and worked solution →The mass of NaOH (M = 40 g/mol) required to prepare 500 mL of a 0.20 M NaOH solution isRead the answer and worked solution →

Worked practice questions

The mole fraction of ethylene glycol in a 20 % (w/w) aqueous solution (molar masses: glycol 62, water 18) is closest to

  1. 0.068
  2. 0.032
  3. 0.100
  4. 0.150
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Correct answer: A. 0.068

1. Consider 100 g of solution: 20 g glycol + 80 g water. 2. Moles of glycol = 20 / 62 = 0.322 mol. 3. Moles of water = 80 / 18 = 4.444 mol. 4. x_glycol = 0.322 / (0.322 + 4.444) = 0.068. _Source: syllabus Chemistry, Unit 1 "Solutions", Example 1.1_

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5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The molarity is closest to

  1. 0.125 M
  2. 0.278 M
  3. 0.400 M
  4. 0.500 M
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Correct answer: B. 0.278 M

1. Moles of NaOH = 5 / 40 = 0.125 mol. 2. Volume of solution = 450 / 1000 = 0.450 L. 3. Molarity = moles / volume = 0.125 / 0.450 = 0.278 mol/L. 4. So the solution is 0.278 M. _Source: syllabus Chemistry, Unit 1 "Solutions", Example 1.2_

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Which of the following concentration units of a solution is temperature-dependent?

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

1. Molality is moles of solute per kg of solvent — mass does not change with temperature. 2. Mass percentage is w/w — mass ratio, temperature independent. 3. Mole fraction is a ratio of moles — no volume, so temperature independent. 4. Molarity is moles per LITRE of solution; volume depends on temperature, so molarity varies with T. _Source: syllabus Chemistry, Unit 1 "Solutions", §1.2_

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