Question

Assertion (A): Cu cannot liberate \( H_2 \) on reaction with dilute mineral acids. Reason (R): Cu has positive electrode potential.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Metals like copper, with a positive electrode potential, are less reactive and do not readily release hydrogen when reacting with dilute acids.

Answer 1

The Correct Option is D

Step 1: Cu does not liberate hydrogen gas when it reacts with dilute mineral acids because copper is less reactive and cannot displace hydrogen from dilute acids. However, copper has a positive electrode potential, which means it is less likely to lose electrons and participate in such reactions, but this does not directly explain the inability to liberate hydrogen gas. 

Step 2: Thus, Assertion (A) is false, and Reason (R) is true, but they are not logically connected.