Question

Assertion (A) $Cu$ cannot liberate hydrogen from acids.
Reason (R) Because it has positive electrode potential.

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $R$ is correct; $A$ is incorrect.

Answer 1

Answer: (A)

Both Assertion and Reason are correct and Reason is correct explanation of Assertion. Cu can, not liberate hydrogen from acids because it has positive electrode potential. Metals having negative value of electrode potential liberate $H _{2}$ gas.