Question

Two metal rods A, B are dipped in their ionic solutions respectively. Following reaction occurs at each electrode:
$A\to A^{2+}+2e^{-}{B}^{2+}+2e^{-}\to B$
Which rod will acquire negative charge?

• A. A
• B. B
• C. Both A and B
• D. Neither A nor B.

Answer 1

The correct option is A

A

What we constructed is electrochemical cell.

The electrode melts into the electrolytic solution as $A^{2+}$ ions leaving electrons on the rod A since $A\to A^{2+}+2e^{-}$
So rod A, where oxidation reaction happens, will acquire negative charge because of e^- released during oxidation reaction.