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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn164

Select ALL rows where the name and the stated oxidation number of P are both correct.

A $Ba (H X_{2} PO X_{2}) X_{2}$ , barium hypophosphite, P $+ 1$
B $Na X_{2} HPO X_{3}$ , sodium hydrogenphosphite, P $+ 3$
C $Na X_{2} HPO X_{4}$ , disodium hydrogenphosphate, P $+ 5$
D $H X_{4} P X_{2} O X_{7}$ , diphosphoric acid, P $+ 4$

Answer: A, B, C

Hypophosphite

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

:

2 + x - 4 = - 1

,

+ 1

.

Na X_{2} HPO X_{3}

:

2 + 1 + x - 6 = 0

,

+ 3

.

Na X_{2} HPO X_{4}

:

+ 5

.

H X_{4} P X_{2} O X_{7}

:

4 + 2 x - 14 = 0

gives

+ 5

, so the last row is wrong.

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