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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn093

Select all correct name assignments (anions derived from phosphate $PO X_{4} X^{3 -}$ with hydrogen- prefixes).

A $Na X_{2} HPO X_{4}$ - sodium hydrogenphosphate
B $NaH X_{2} PO X_{4}$ - sodium hydrogenphosphate
C $Na X_{4} P X_{2} O X_{7}$ - sodium pyrophosphate (diphosphate)
D $Na X_{3} PO X_{4}$ - sodium phosphate

Answer: A, C, D

HPO X_{4} X^{2 -}

is hydrogenphosphate (two Na).

P X_{2} O X_{7} X^{4 -}

is pyrophosphate (diphosphate) and

PO X_{4} X^{3 -}

is phosphate.

NaH X_{2} PO X_{4}

contains

H X_{2} PO X_{4} X^{-}

, dihydrogenphosphate, so the second pair is wrong.

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