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JEE Main levelSingle correct optionDifficulty 2 of 3mc182

A compound contains $29.1%$ Na, $40.5%$ S and $30.4%$ O by mass. Its empirical formula is (Na = 23, S = 32, O = 16)

A $Na X_{2} S X_{2} O X_{3}$
B $Na X_{2} SO X_{4}$
C $Na X_{2} SO X_{3}$
D $NaSO X_{3}$

Answer: A

Moles per 100 g: Na = 1.265, S = 1.266, O = 1.900. Dividing by 0.633 gives about 2 : 2 : 3. The empirical formula is Na2S2O3.

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