Question

When an aqueous solution of $AgNO_{3}$is electrolysed between platinum electrodes, the substances liberated at anode and cathode are

• A. Silver is deposited at cathode and $H_{2}$is liberated at anode
• B. Silver is deposited at cathode and $H_{2}$is liberated anode.
• C. Hydrogen is liberated at cathode and $O_{2}$is liberated at anode
• D. Silver is deposited at cathode and Pt is dissolved in electrolyte.

Answer 1

Answer: (A)

Silver is deposited at cathode and $H_{2}$is liberated at anode

Answer 2

At cathode : $A{g^{+}}_{(aq)} + e^{-} \rightarrow Ag_{(s)}$

At anode : $2O{H^{-}}_{(aq)} \rightarrow \frac{1}{2}O_{2(g)} + H_{2}O_{(l)} + 2e^{-}$