Chemistry Question from JEE Main 2026 · 21 January, Shift 2

The first and second ionization constants of $H_{2}X$ are $2.5 \times 10^{-8}$ and $1.0 \times 10^{-13}$ respectively. The concentration of $X^{2-}$ in $0.1 \, \text{M}$ $H_{2}X$ solution is _____ $\times 10^{-15} \, \text{M}$. (Nearest Integer)