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General — Medium JEE chemistry MCQ

On decreasing the $p \mathrm{H}$ from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from $10^{-4} \mathrm{~mol} \mathrm{~L}^{-1}$ to $10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}$. The $p\mathrm{~K}_{\mathrm{a}}$ of $\mathrm{HX}$ is
  1. A. 3
  2. B. 4
  3. C. 5
  4. D. 2

Solution

The correct option is **B**.

CHEMISTRY

medium • PYQ Reworded
Question
Read carefully, then pick the best option.
On decreasing the pHp \mathrm{H} from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from 10−4 mol L−110^{-4} \mathrm{~mol} \mathrm{~L}^{-1} to 10−3 mol L−110^{-3} \mathrm{~mol} \mathrm{~L}^{-1}. The p Kap\mathrm{~K}_{\mathrm{a}} of HX\mathrm{HX} is
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General — Medium JEE Chemistry MCQ | MyGoalPrep