JEE Main 2022 · 25 Jun · Shift 2 · Chemistry Q86

← JEE Main 2022 · 25 Jun · Shift 2

ChemistryInteger+4 / -1Question 86 of 90

Consider the following reactions :
$\mathrm{PCl_3+H_2O\rightarrow A+HCl}$
$\mathrm{A+H_2O\rightarrow B+HCl}$
The number of ionisable protons present in the product B is ______.

Your answer

Answer and worked solution

Official answer: 2

Hydrolysis. $\mathrm{PCl_3}$ hydrolyses stepwise to phosphorous acid, B $=\mathrm{H_3PO_3}$ , i.e. $\mathrm{HP(O)(OH)_2}$ .

Ionisable protons. Only the two O-H hydrogens; the P-H is not acidic. So 2.

Answer: 2

Topics:Oxoacids Group 15

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JEE Main 2022 · 25 Jun · Shift 2, Chemistry question 86