Question 14 — Assertion (A): Copper sulfate conducts - Questions at the end of the chapter - Chapter 9 - Atomic Foundations of Matter (Exploration)

Last updated at July 3, 2026 by

Question 14
Assertion (A): Copper sulfate conducts electricity in the molten state but not in the solid state. Reason (R): Copper and sulfate ions are fixed in the lattice in molten state, while in solid state they can move freely. Choose the correct option: (i) Both A and R are true, and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
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Answer: (iii)

  • A is true — molten copper sulfate conducts, solid does not.
  • R is false — it is the other way round: ions are fixed in the solid and free to move in the molten state.
Molten vs Solid Conductivity Ions fixed in the solid, free when molten So the reason is reversed A true but R false: option iii
Back to: 9.6 Properties of the Ionic and the Covalent Compounds
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