Concentration \[C{{N}^{-}}\] in \[0.1\,M\,HCN\] is\[[{{K}_{a}}=4\times {{10}^{-10}}]\] [RPET 2000]

Concentration \[C{{N}^{-}}\] in \[0.1\,M\,HCN\] is\[[{{K}_{a}}=4\times

1.	Concentration \[C{{N}^{-}}\] in \[0.1\,M\,HCN\] is\[[{{K}_{a}}=4\times {{10}^{-10}}]\] [RPET 2000]
A.	\[2.5\times {{10}^{-6}}M\]
B.	\[4.5\times {{10}^{-6}}M\]
C.	\[6.3\times {{10}^{-6}}M\]
D.	\[9.2\times {{10}^{-6}}M\]
Answer» D. \[9.2\times {{10}^{-6}}M\]