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JEE Main levelSingle correct optionDifficulty 2 of 3bn193

Washing soda is sodium carbonate decahydrate. Its formula is

A $Na X_{2} CO X_{3} \cdot H X_{2} O$
B $NaCO X_{3} \cdot 10 H X_{2} O$
C $Na X_{2} CO X_{3} \cdot 7 H X_{2} O$
D $Na X_{2} CO X_{3} \cdot 10 H X_{2} O$

Answer: D

Carbonate is

CO X_{3} X^{2 -}

, so two Na are needed; deca means 10 water molecules:

Na X_{2} CO X_{3} \cdot 10 H X_{2} O

.

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