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Science · 2024 · 1 mark
CBSE 2024 · Region 5 · Set 3 · Q3
An aqueous solution 'A' turns phenolphthalein solution pink. When another aqueous solution 'B' is added to the pink solution, the pink colour disappears. Now when a few drops of solution 'A' are added to this reaction, the mixture appears pink again. The respective changes in the nature of the solution are from :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
basic → acidic → basic
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.