Which one of the following statements is not true ?

Question

( A ) 96,500 coulombs of electricity when passed through a $CuSO_4$ solution deposit 1g equivalent of copper at the cathode
( B ) $pH +pOH =14$ for all aqueous solutions
( C ) The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$
( D ) The pH of $1 \times 10^{-8} M\; HCl$ is 8