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Science · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 3 · Q18
Which of the following compounds is used for removing permanent hardness of water?
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Washing soda
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.