ChemistryJEE Main 21 Jan 2026, Shift 2·Q21·Numerical·Easy–moderate

Equilibrium · Ionisation of dibasic acid

The first and second ionization constants of

\ce{H2X}

are

2.5\times10^{-8}

and

1.0\times10^{-13}

respectively. The concentration of

\ce{X^{2-}}

in 0.1 M

\ce{H2X}

solution is

\times10^{-15}

M. (Nearest Integer)

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