Question

Two metal rods A, B are dipped is their ionic solutions respectively.
Following reactions happen at each electrode.
$A\to A^{2+}+2e^{-}{B}^{2+}+2e^{-}\to B$
Which of these two rods acquire negative charge?

• A. A
• B. 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 and leaving electrons in the rod A.
$\because A\to A^{2+}+2e^{-}$
So this rod where oxidation reaction happens acquires negative charge because of e^- resulted from oxidation reaction.