Calculate the $[H^{+}]$ ion concentration in a $1.00 \ M$ $HCN$ solution $(K_a = 4 \times 10^{-10})$.
- A$4 \times 10^{-14} \ \text{mole/litre}$
- B$2 \times 10^{-5} \ \text{mole/litre}$
- C$2.5 \times 10^{-5} \ \text{mole/litre}$
- DNone of these
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