Which of the following is not a protonic acid | vedclass

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Question

(B) protonic acid is a substance that can donate a proton ($H^+$ ion) in an aqueous solution.$SO_2(OH)_2$ is $H_2SO_4$,which is a strong protonic acid

Vedclass · Accepted Answer

$B(OH)_3$

Vedclass · Answer

(B) protonic acid is a substance that can donate a proton ($H^+$ ion) in an aqueous solution.$SO_2(OH)_2$ is $H_2SO_4$,which is a strong protonic acid.$PO(OH)_3$ is $H_3PO_4$,which is a protonic acid.$SO(OH)_2$ is $H_2SO_3$,which is a protonic acid.$B(OH)_3$ is boric acid $(H_3BO_3)$. It acts as a Lewis acid because it accepts a lone pair of electrons from $OH^-$ ions in water to form $[B(OH)_4]^-$,rather than donating a proton. Therefore,it is not a protonic acid.

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 $(HCN)$: $4.9 \times 10^{-10}$

Which of the following is not a protonic acid?

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