Q5 / 90 · JEE Main 2023 (10 Apr Shift 2) · Chemistry

Number of water molecules in washing soda and soda ash respectively are :

A
$1 and 10$
B
$10 and 1$
Correct answer
C
$10 and 0$
D
$1 and 0$

Solution

The chemical formula for washing soda is ${Na}_{2} {CO}_{3} . 10 H_{2} O$ , which means that each molecule of washing soda contains $10$ water molecules.

The chemical formula for soda ash is ${Na}_{2} {CO}_{3}$ , which does not contain any water molecules.

Therefore, there are $10$ water molecules in washing soda and $0$ water molecules in soda ash.

Hence, the correct answer is option: 'C'.

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