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JEE Main levelSingle correct optionDifficulty 2 of 3bn189

Which is the name of $Na X_{2} HPO X_{4}$ ?

Adisodium hydrogenphosphate
Bsodium dihydrogenphosphate
Cdisodium phosphate
Ddisodium hydrogenphosphite

Answer: A

The anion

HPO X_{4} X^{2 -}

is hydrogenphosphate; two Na give 'disodium'. Sodium dihydrogenphosphate is

NaH X_{2} PO X_{4}

.

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