Which one of the following statements is not true?

  • A
    The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$
  • B
    $pH + pOH = 14$ for all aqueous solutions at $298 \ K$
  • C
    The $pH$ 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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Arrange the following $1 \ L$ aqueous solutions of equal concentration in increasing order of their $pH$:
$CH_3COONa, KI, NH_4Cl, HNO_3$

The $pH$ value of a decinormal solution of $NH_4OH$ which is $20\%$ ionised,is

In which case is the change in $pH$ maximum?

The decreasing order of electrical conductivity of the following aqueous solutions is:
$0.1 \ M$ Formic acid $(a)$
$0.1 \ M$ Acetic acid $(b)$
$0.1 \ M$ Benzoic acid $(c)$

When $10 \, mL$ of $0.1 \, M$ acetic acid $(pK_a = 5.0)$ is titrated against $10 \, mL$ of $0.1 \, M$ ammonia solution $(pK_b = 5.0)$,the equivalence point occurs at $pH$:

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