Concentration $C{N^ - }$ in $0.1\,M\,HCN$ is $[{K_a} = 4 \times {10^{ - 10}}]$

  • A

    $2.5 \times {10^{ - 6}}M$

  • B

    $4.5 \times {10^{ - 6}}M$

  • C

    $6.3 \times {10^{ - 6}}M$

  • D

    $9.2 \times {10^{ - 6}}M$

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Base $K _{ b }$
Dimethylamine, $\left( CH _{3}\right)_{2} NH$ $5.4 \times 10^{-4}$
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Urea, $CO \left( NH _{2}\right)_{2}$ $1.3 \times 10^{-14}$

Which among the given acids has lowest $pKa$ value