The number of acidic protons present in H_3PO | vedclass

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Question

(A) The acidity of oxoacids of phosphorus depends on the number of $OH$ groups directly attached to the phosphorus atom. Protons attached directly to

Vedclass · Accepted Answer

$1$,$2$ and $3$

Vedclass · Answer

(A) The acidity of oxoacids of phosphorus depends on the number of $OH$ groups directly attached to the phosphorus atom. Protons attached directly to the phosphorus atom are not acidic.$1$. In $H_3PO_2$ (hypophosphorous acid),there is one $P-OH$ group,so it is monobasic (number of acidic protons = $1$).$2$. In $H_3PO_3$ (phosphorous acid),there are two $P-OH$ groups,so it is dibasic (number of acidic protons = $2$).$3$. In $H_3PO_4$ (phosphoric acid),there are three $P-OH$ groups,so it is tribasic (number of acidic protons = $3$).Therefore,the number of acidic protons are $1$,$2$ and $3$ respectively. The correct option is $A$.

Column-$I$	Column-$II$
$A$. Diborane	$1$. Used as a flux for soldering metals
$B$. Gallium	$2$. Crystalline form of silica
$C$. Borax	$3$. Banana bonds
$D$. Alumino silicate	$4$. Low melting,high boiling,useful for measuring high temperatures
$E$. Quartz	$5$. Used as catalyst in petrochemical industries

The number of acidic protons present in $H_3PO_2$,$H_3PO_3$ and $H_3PO_4$ respectively,are .....

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