Consider the following electrochemical cell at standard condition.
$Au(s)\left| {Q{H_2},Q} \right|N{H_4}X(0.01M)||A{g^ + }(1M)\mid Ag(s){E_{{\rm{cell }}}} = + 0.4V$
The couple $Q{H_2}/Q$ represents quinhydrone electrode, the half cell reaction is given below
