CBSE 2025 · Region 2 · Set 3 · Q28 · 3 marks
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.
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.
Metals and Non-metalsChemical Properties of MetalsAnalyseshort_answermedium
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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.