CBSE 2025 · Region 6 · Set 2 · Q2 · 1 mark
The formula of washing soda is
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O}$
Acids, Bases and SaltsChemicals from Common SaltRemembermcqeasy
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.