$A$ buffer solution is prepared by mixing $0.1 \ M \ HCN$ and $0.2 \ M \ NaCN$. What is the $pH$ of the buffer solution if $pKa$ of $HCN$ is $9.3$? $(\log 2 = 0.3010)$
- A$4.2$
- B$2$
- C$9.6$
- D$6.15$
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