Which is the correct alternate for hydrolysis constant of \[N{{H}_{4}}

1.	Which is the correct alternate for hydrolysis constant of \[N{{H}_{4}}CN\] [CBSE PMT 1989]
A.	\[\sqrt{\frac{{{K}_{w}}}{{{K}_{a}}}}\]
B.	\[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\]
C.	\[\sqrt{\frac{{{K}_{b}}}{c}}\]
D.	\[\frac{{{K}_{a}}}{{{K}_{b}}}\]
Answer» C. \[\sqrt{\frac{{{K}_{b}}}{c}}\]

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Which is the correct alternate for hydrolysis constant of \[N{{H}_{4}}CN\] [CBSE PMT 1989]

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