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JEE Main levelSingle correct optionDifficulty 2 of 3bn186

Name $Na X_{2} S X_{2} O X_{3} \cdot 5 H X_{2} O$ (photographic hypo).

Asodium thiosulfate pentahydrate
Bsodium thiosulfate hexahydrate
Csodium sulfite pentahydrate
Dsodium tetrathionate pentahydrate

Answer: A

S X_{2} O X_{3} X^{2 -}

is thiosulfate and five water molecules give pentahydrate.

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