$HCN$ is $1 \%$ ionized in its $0.2 \ M$ aqueous solution. At the same temperature,what would be its percent ionization in its $0.02 \ M$ aqueous solution?

  • A
    $10 \%$
  • B
    $\sqrt{10} \%$
  • C
    $2 \sqrt{5} \%$
  • D
    $5 \sqrt{2} \%$

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