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JEE Main levelSingle correct optionDifficulty 2 of 3bn129

Using the classical hypo-/-ite name of the anion $H X_{2} PO X_{2} X^{-}$ (P in $+ 1$ ), what is $Ba (H X_{2} PO X_{2}) X_{2}$ called?

Abarium hypophosphate
Bbarium phosphite
Cbarium dihydrogenphosphate
Dbarium hypophosphite

Answer: D

Barium is

+ 2

, so two

H X_{2} PO X_{2} X^{-}

are needed. Phosphorus is

+ 1

, the lowest member of the series (below phosphite

+ 3

and phosphate

+ 5

), so the name takes hypo- and -ite. Hypophosphate refers to

H X_{4} P X_{2} O X_{6}

.

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