An acidified solution of \(0.05 M Zn ^{2+}\) is saturated with \(0.1 M H _2 S\). What is the minimum molar concentration…

An acidified solution of \(0.05 M Zn ^{2+}\) is saturated with \(0.1 M H _2 S\). What is the minimum molar concentration (M) of \(H ^{+}\)required to prevent the precipitation of \(ZnS\) ?

Use \(K _{ sp }( ZnS )=1.25 \times 10^{-22}\) and overall dissociation constant of \(H _2 S , K _{ NET }= K _1 K _2=1 \times 10^{-21}\)
[JEE Advanced 2020, Paper-2]