The degree of dissociation of \( 0.1 M \mathrm{HCN} \) solution is \( 0.01 \% \). Its ionisation...

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The degree of dissociation of \( 0.1 M \mathrm{HCN} \) solution is \( 0.01 \% \). Its ionisation constant would be
(a) \( 10^{-3} \)
(b) \( 10^{-5} \)
(c) \( 10^{-7} \)
[PMT (Raj.) 1999]
(d) \( 10^{-9} \)
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