Which one of the following statements is not true?
- AThe conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$
- B$pH + pOH = 14$ for all aqueous solutions at $298 \ K$
- CThe $pH$ of $1 \times 10^{-8} \ M \ HCl$ is $8$
- D$96,500 \ C$ of electricity when passed through a $CuSO_4$ solution deposits $1 \ g$ equivalent of copper at the cathode
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