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ICSE Class 10 Chemistry Question 3 of 10

Analytical Chemistry — Question 10

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Question 10

Assertion (A): Zinc oxide reacts with acids as well as bases to form salt and water.

Reason (R): Zinc oxide is amphoteric in nature.

  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

Both A and R are true and R is the correct explanation of A.

Explanation — Zinc oxide reacts with both acids and concentrated alkalis (NaOH and KOH) forming salt and water.

ZnO + 2HCl ⟶ ZnCl2 + H2O

ZnO + 2NaOH ⟶ Na2ZnO2 + H2O

Hence the assertion (a) is true.

Reason (R) is true because zinc oxide is amphoteric in nature, reacts with both acids and concentrated alkalis forming salt and water. Hence Both A and R are true and reason (R) is the correct explanation of assertion(A).