Weak acids are partially ionised in aqueous s | vedclass

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(A) The relative strength of an acid is directly proportional to its ionisation constant $(K_a)$.$A$ larger $K_a$ value indicates a stronger acid beca

Vedclass · Accepted Answer

$4 < 2 < 1 < 3$

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(A) The relative strength of an acid is directly proportional to its ionisation constant $(K_a)$.$A$ larger $K_a$ value indicates a stronger acid because it ionises to a greater extent in aqueous solution.Comparing the given $K_a$ values:$HCN: 4.9 	imes 10^{-10}$ $(4)$$HClO: 3.0 	imes 10^{-8}$ $(2)$$HCOOH: 1.8 	imes 10^{-4}$ $(1)$$HNO_2: 4.5 	imes 10^{-4}$ $(3)$Arranging them in increasing order of $K_a$: $4.9 	imes 10^{-10} Therefore,the increasing order of acid strength is $4 < 2 < 1 < 3$.

Acid Index	Acid Name and Ionisation Constant $(K_a)$
$1$	Formic acid $(HCOOH)$: $1.8 \times 10^{-4}$
$2$	Hypochlorous acid $(HClO)$: $3.0 \times 10^{-8}$
$3$	Nitrous acid $(HNO_2)$: $4.5 \times 10^{-4}$
$4$	Hydrocyanic acid $(HCN)$: $4.9 \times 10^{-10}$

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