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Science · 2023 · 1 mark
CBSE 2023 · Region 4 · Set 1 · Q6
The name of the salt used to remove permanent hardness of water is:
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Sodium carbonate decahydrate $\displaystyle \left(\mathrm{Na}_{2} \mathrm{CO}_{3} .10 \mathrm{H}_{2} \mathrm{O}\right)$
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.