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 such as copper, with a positive electrode potential, are less reactive and do not readily produce hydrogen gas when reacting with dilute acids.

Answer 1

The Correct Option is D

Copper (Cu) does not release hydrogen gas when it reacts with dilute mineral acids because it is a less reactive metal. Due to its low reactivity, copper is unable to displace hydrogen from the acids. While copper has a positive electrode potential, which indicates that it is less prone to losing electrons and participating in such reactions, this property does not directly explain why it does not release hydrogen gas. \bigskip Step 2: Therefore, Assertion (A) is incorrect, while Reason (R) is true, but they are not logically linked to each other. \bigskip