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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus

JEE Main levelSingle correct optionDifficulty 2 of 3pn133

The total basicity (number of ionisable hydrogen atoms) of $H X_{3} PO X_{2}$ , $H X_{3} PO X_{3}$ and $H X_{4} P X_{2} O X_{7}$ taken together is

A7
B8
C6
D10

Answer: A

Only O-H hydrogens ionise. H3PO2 has one OH (basicity 1), H3PO3 has two OH (basicity 2) and H4P2O7 has four OH (basicity 4). Sum = 1 + 2 + 4 = 7.

Practice p-Block Elements: Groups 15 and 16 More on Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus

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