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ICSE Class 9 Chemistry Question 14 of 18

Chemical Changes and Reactions — Question 13

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13
Question

Question 2(i)

Assertion (A): Zinc can displace copper from aqueous copper sulphate solution.

Reason (R): Copper is placed above zinc in the reactivity series.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
Answer

A is true but R is false.

Explanation — Zinc is more reactive than copper. So, zinc is placed above copper in reactivity series. Hence, zinc displaces copper from aqueous copper sulphate solution. Hence the assertion (A) is true.

CuSO4 (aq) + Zn → ZnSO4 + Cu ↓

Copper is less reactive than zinc and is placed below zinc in reactivity series. Less reactive elements cannot displace more active elements. Hence, copper cannot displace zinc from its salt solution. Hence the reason (R) is false.