A $0.1\, M$ solution of $HF$ is $1\%$ ionized. What is the $K_a$

  • A

    ${10^{ - 5}}$

  • B

    ${10^{ - 4}}$

  • C

    $3 \times {10^{ - 5}}$

  • D

    $3 \times {10^{ - 4}}$

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