Which of the following buffers will have a $pH$ value greater than $7$?

  • A
    $CH_3COOH + CH_3COONa$
  • B
    $HCOOH + HCOOK$
  • C
    $CH_3COONH_4 + CH_3COOH$
  • D
    $NH_4OH + NH_4Cl$

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