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 $O_2$ is liberated at anode
• B. silver is deposited at cathode and $H_2$ is liberated | at 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)

At cathode : $Ag^{+}_{\left(aq\right)}+e^{-} \to Ag_{\left(s\right)}$
At anode : $2OH^{-}_{\left(aq\right)} \to\frac{1}{2} O_{2\left(g\right)}+H_{2}O_{\left(l\right)}+2e^{-}$