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A weak acid is `0.1%` ionised in `0.1M` solution. Its ionisation constant is :

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A weak acid is `0.1%` ionised in `0.1M` solution. Its ionisation constant is :
A. `10^(-5)`
B. `10^(-6)`
C. `10^(-8)`
D. `10^(-9)`
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Correct Answer - D
`K_(a) = Calpha^(2) = 0.1 xx ((0.1)/(100))^(2)`
`= 1 xx 10^(-9)`
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