Self-ionisation of liquid ammonia occurs as,2 | vedclass

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(D) According to the solvent system definition of acids and bases,an acid is a substance that increases the concentration of the characteristic cation

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(D) According to the solvent system definition of acids and bases,an acid is a substance that increases the concentration of the characteristic cation of the solvent.In liquid ammonia,the self-ionisation is $2NH_3 \rightleftharpoons NH_4^+ + NH_2^-$.The characteristic cation is $NH_4^+$.Therefore,any substance that increases the concentration of $NH_4^+$ ions in liquid ammonia acts as an acid.$NH_4^+$ itself is the conjugate acid of the solvent $NH_3$ and acts as an acid in this system.Thus,both $NH_4^+$ and any species that generates $NH_4^+$ in this solvent are considered acids.

List-$I$ (Acid)	List-$II$ $(K_a)$
$A$. Phenol	$I$. $1 \times 10^{-13}$
$B$. Benzoic acid	$II$. $3.0 \times 10^{-8}$
$C$. $HClO$	$III$. $1.0 \times 10^{-10}$
$D$. $CH_3COOH$	$IV$. $6.5 \times 10^{-5}$
	$V$. $1.75 \times 10^{-5}$

Self-ionisation of liquid ammonia occurs as,$2NH_3 \rightleftharpoons NH_4^+ + NH_2^-$; $K = 10^{-10}$. In this solvent,an acid might be

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