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ChemistryJEE Main 2 Apr 2026, Shift 2·Q2·MCQ·Moderate

Equilibrium · Dibasic acid with common ion

The first and second ionization constants of a weak dibasic acid HX2A\ce{H2A} are 8.1×10−88.1\times10^{-8} and 1.0×10−131.0\times10^{-13} respectively. 0.1 mol of HX2A\ce{H2A} was dissolved in 1L of 0.1 M HCl solution. The concentration of HAX−\ce{HA-} in the resultant solution is :
  1. (1)0.1 M
  2. (2)9.53×10−69.53\times10^{-6} M
  3. (3)8.1×10−88.1\times10^{-8} M
  4. (4)1.0×10−131.0\times10^{-13} M

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See the full 2 Apr 2026, Shift 2 paper