Which of the following expression is not applicable on the hydrolysis equilibrium : `CN^(-)H_(2)OrArrHCN+OH^(-)`

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Answer :

Which of the following expression is not applicable on the hydrolysis equilibrium : `CN^(-)H_(2)OrArrHCN+OH^(-)` A. ... H+] =sqrt((K_(w).K_(a))/(C))`

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