9. A concentrated \( NaCl ( aq ) \) solution is electrolysed in an electrolytic cell using Pt electrodes. If over voltage of \( O _{2} \) is \( 0.81 V \) and \( Cl _{2} \) is \( 0.08 V \). Then both gases will start liberating when \( [ NaCl ]=x \times 10^{-y} M \).
[Assume: At anode \( O _{2}( g ) \) and \( Cl _{2}( g ) \) are maintained at 1 bar pressure each, concentration of \( NaCl \) is Find \( x+y \) written in scientific notation.]
Take \( : \frac{2.303 R RT }{ F }=0.06 \) and \( E _{ H _{2} O / O _{2}}^{\circ}=-1.23 V \) and \( E _{ Cl / Cl _{2}}^{\circ}=-1.36 V \)
