Chemistry MCQs for 10th Class (Punjab Board)

This page has over 2,400 multiple-choice questions for Chemistry (10th Class (Punjab Board)), arranged in 13 chapters and 18 topics. The chapters include States of Matter and Phase Changes, Stoichiometry, Electrochemistry, Reaction Kinetics and Salts. Every question has four options, an instant answer and, where available, a short explanation.

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Chapters and topics

  • States of Matter and Phase Changes 1 topic · 160 MCQs
  • Stoichiometry 2 topics · 251 MCQs
  • Electrochemistry 2 topics · 332 MCQs
  • Reaction Kinetics 1 topic · 117 MCQs
  • Salts 1 topic · 125 MCQs
  • Nitrogen and Sulphur 1 topic · 180 MCQs
  • Water 2 topics · 223 MCQs
  • Organic Chemistry 2 topics · 356 MCQs
  • Hydrocarbons 2 topics · 223 MCQs
  • Monohydroxy Alkanes or Alcohols 1 topic · 137 MCQs
  • Carboxylic Acids 1 topic · 114 MCQs
  • Biochemistry 1 topic · 136 MCQs
  • Polymers 1 topic · 131 MCQs

Sample Chemistry MCQs

Try these questions, then open the full practice to work through every chapter. Tap “Show the answer” after you choose.

Q1. 100 °C in kelvin is:

  1. −173 K
  2. 473 K
  3. 373 K
  4. 100 K
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Answer: C. 373 K

The correct answer is “373 K”. T(K) = T(°C) + 273.

Q2. Convert 0.2 mol/dm³ of H₂SO₄ (M = 98 g/mol) into g/dm³:

  1. 2.04 × 10⁻³ g/dm³
  2. 39.2 g/dm³
  3. 490 g/dm³
  4. 19.6 g/dm³
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Answer: D. 19.6 g/dm³

The correct answer is “19.6 g/dm³”. g/dm³ = mol/dm³ × M = 0.2 × 98 = 19.6.

Q3. When acidified KMnO₄ is decolourised, manganese changes from:

  1. colourless to brown (iodine formed)
  2. oxidised to iodine
  3. +7 (manganate(VII)) to +2 (Mn²⁺)
  4. purple to colourless
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Answer: C. +7 (manganate(VII)) to +2 (Mn²⁺)

+7 (manganate(VII)) to +2 (Mn²⁺). KMnO₄ (purple) is reduced by reducing agents; KI (colourless) is oxidised to brown iodine by oxidising agents.

Q4. The salt formed from H₂SO₄ + CuO is:

  1. copper(II) chloride
  2. sodium chloride
  3. ammonium nitrate
  4. copper(II) sulfate
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Answer: D. copper(II) sulfate

The correct answer is “copper(II) sulfate”. H₂SO₄ + CuO: copper(II) sulfate.

Q5. Zinc reacts with dilute sulfuric acid. The products are:

  1. zinc oxide and hydrogen
  2. zinc sulfate and water
  3. zinc sulfate and carbon dioxide
  4. zinc sulfate and hydrogen
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Answer: D. zinc sulfate and hydrogen

Metal + acid → salt + hydrogen: zinc + sulfuric acid → zinc sulfate + hydrogen.

Q6. A major source of the pollutant CO is:

  1. incomplete combustion of fuels
  2. rice fields, livestock and landfills
  3. burning sulfur-containing coal and oil
  4. diesel engines and burning
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Answer: A. incomplete combustion of fuels

The correct answer is “incomplete combustion of fuels”. CO: incomplete combustion of fuels.

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