Question

Assertion (A): Zinc displaces copper from copper sulphate solution.

Reason (R): The E of Zn is −0.76V and that of Cu is +0.34V.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of А.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If both A and R are true, and R is the correct explanation of A.

Explanation:

The assertion is true because zinc is more reactive than copper and spontaneously displaces it from a copper sulphate solution. The reason is also true and provides the correct explanation because zinc has a lower (more negative) standard reduction potential (E° = −0.76 V) than copper (E° = +0.34 V). This difference in electrode potentials confirms that zinc has a stronger tendency to oxidise and act as a reducing agent, allowing it to readily donate electrons to Cu²⁺ ions.