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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

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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
A. `3 xx 10^(-1)`
B. `1 xx 10^(-3)`
C. `1 xx 10^(-5)`
D. `1 xx 10^(-7)`
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Correct Answer - C
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The pH of a 0.1 molar solution of the acid HQ is 3
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