JEE Main 2024 · Chemistry · s-Block, p-Block Elements and Hydrogen · easy

The total number of P-OH groups present in H3PO2, H3PO3, H3PO4 and H4P2O7 taken together is

Numerical answer

The total number of

\mathrm{P{-}OH}

groups present in

\mathrm{H_3PO_2}

\mathrm{H_3PO_3}

\mathrm{H_3PO_4}

and

\mathrm{H_4P_2O_7}

taken together is

Show answer and solution

Answer: 10

Only the

\mathrm{P{-}OH}

hydrogens are ionisable; P-H hydrogens are not.

\mathrm{H_3PO_2}

(hypophosphorous): two P-H, one P-OH

=1

\mathrm{H_3PO_3}

: one P-H, two P-OH

=2

\mathrm{H_3PO_4}

: three P-OH

=3

\mathrm{H_4P_2O_7}

(pyrophosphoric acid, two P atoms joined through a P-O-P bridge): each P carries two P-OH

=4

. Total

=1+2+3+4=10

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