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JEE Main levelSingle correct optionDifficulty 2 of 3bn122

Using hydrogen- prefixes for acid salts, what is the IUPAC name of $Na X_{2} HPO X_{4}$ ?

Asodium dihydrogenphosphate
Btrisodium phosphate
Cdisodium hydrogenphosphite
Ddisodium hydrogenphosphate

Answer: D

The anion

HPO X_{4} X^{2 -}

is phosphate retaining one hydrogen, so hydrogenphosphate. Two

Na X^{+}

give the prefix di-: disodium hydrogenphosphate.

NaH X_{2} PO X_{4}

would be the dihydrogenphosphate.

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