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Question:

The $\mathrm{pH}$ of a $0.1$ molar solution of the acid $\mathrm{HQ}$ is 3 . The value of the ionization constant, $\mathrm{K}_{\mathrm{a}}$ of this acid is :-

  1. $1 \times 10^{-7}$

  2. $3 \times 10^{-7}$

  3. $1 \times 10^{-3}$

  4. $1 \times 10^{-5}$


Correct Option: , 4

Solution:

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