In the following acid-base reactions,in which case can the backward reaction be favoured?

  • A
    $EtO^{-} + C_6H_5OH \rightleftharpoons EtOH + C_6H_5O^{-}$
  • B
    $KH + EtOH \rightleftharpoons K^{+} + EtO^{-} + H_2$
  • C
    $Me_3CO^{-} + H_2O \rightleftharpoons Me_3COH + OH^{-}$
  • D
    $C_{10}H_7O^{-} + CH_3OH \rightleftharpoons C_{10}H_7OH + CH_3O^{-}$

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In the reaction $HC_2O_4^{-} + PO_4^{3-} \rightarrow HPO_4^{2-} + C_2O_4^{2-}$,which are the two Brønsted bases?

Which two sets of reactants best represent the amphoteric character of $Zn(OH)_2$?
Set $1$ : $Zn(OH)_{2(s)}$ and $OH^{-}_{(aq)}$
Set $2$ : $Zn(OH)_{2(s)}$ and $H_2O_{(l)}$
Set $3$ : $Zn(OH)_{2(s)}$ and $H^{+}_{(aq)}$
Set $4$ : $Zn(OH)_{2(s)}$ and $NH_{3(aq)}$

In the following ionic equilibrium,the conjugate acid of $H_2O_2$ is ........
$H_2O_2 + H_2O \rightleftharpoons H_3O^+ + HO_2^-$

The $CH_3COO^-$ ion is a.......

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