Ostwald's Dilution Law

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The pH of a $0.1$ molar solution of the acid HQ is $3$ . The value of the ionisation constant, $K_{a}$ of the acid is

3 \times 1 0^{- 1}

1 \times 1 0^{- 3}

1 \times 1 0^{- 5}

1 \times 1 0^{- 7}