Question

Assertion (A): Copper liberates hydrogen from a dilute solution of hydrochloric acid.

Reason (R): Hydrogen is below copper in electrochemical series.

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 A.

• If A is true, but R is false.

• If A is true, but R is false.

Answer 1

If A is true, but R is false.

Explanation:

The assertion is false because copper (Cu) is a noble metal with a positive reduction potential, meaning it is less reactive than hydrogen and cannot displace or liberate hydrogen gas from dilute acids. The reason is also false because hydrogen is located above copper in the reactivity and electrochemical series, not below it. Therefore, copper lacks the reducing power required to pass electrons to H⁺ ions.