The first and second ionization constants of $\mathrm{H}_2 \mathrm{X}$ are $2.5 imes 10^{-8}$ and

Question

The first and second ionization constants of $\mathrm{H}_2 \mathrm{X}$ are $2.5 	imes 10^{-8}$ and $1.0 	imes 10^{-13}$ respectively. The concentration of $\mathrm{X}^{2-}$ in $0.1 \mathrm{~M} \mathrm{~H}_2 \mathrm{X}$ solution is $\_\_\_\_$ $	imes 10^{-15} \mathrm{M}$. (Nearest Integer)

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See detailed solution for explanation.