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$(i)$ $A$ strong acid has a weak conjugate base.
$(ii)$ An acid is an electron pair acceptor.
The above statements $(i)$ and $(ii)$ are:

Arrange $NH_4^+$,$H_2O$,$H_3O^+$,$HF$,and $OH^-$ in increasing order of their acidic strength.

Arrange the following species in the decreasing order of their basic strength: $(a) OH^{-}, (b) NH_2^{-}, (c) F^{-}$.

Identify the conjugate acid-base pair from the following equilibrium reaction.
$HSO_{3(aq)}^{-} + H_3O_{(aq)}^{+} \rightleftharpoons H_2SO_3 + H_2O$

In which of the following neutralisation reactions will the heat of neutralisation be the highest?

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