The $pH$ of human blood is $7.4$. The $[H^{+}]$ concentration will be:

  • A
    $4 \times 10^{-8} \ M$
  • B
    $2 \times 10^{-8} \ M$
  • C
    $4 \times 10^{-4} \ M$
  • D
    $2 \times 10^{-4} \ M$

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