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Science · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 3 · Q28
Two substances 'A' and 'B' are burnt in air separately. For 'A', ashes are collected and dissolved in water to get solution 'X', while for 'B', fumes…
Two substances 'A' and 'B' are burnt in air separately. For 'A', ashes are collected and dissolved in water to get solution 'X', while for 'B', fumes produced are passed through water to get solution 'Y'. Both the solutions 'X' and 'Y' are then tested with pH paper.
(a)
If 'X' gives light blue colour and 'Y' gives orange colour to the pH paper, then write the nature and range of pH of ' X ' and ' Y '.
(b)
Which one of the two - A and B, is a metal ? Justify your answer.
Marking-scheme solution
(a) X - Basic Y-Acidic ↓ ↓ pH range \(\displaystyle 9-11 \quad \mathrm{pH}\) range \(\displaystyle 4-6\)
(b)
'A' - metal, because it forms basic oxide.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.