A) \[\sqrt{\frac{{{K}_{w}}}{{{K}_{a}}}}\]
B) \[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\]
C) \[\sqrt{\frac{{{K}_{b}}}{c}}\]
D) \[\frac{{{K}_{a}}}{{{K}_{b}}}\]
Correct Answer: B
Solution :
\[N{{H}_{4}}CN\] is a salt of weak acid and weak base and thus for it
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