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Science · 2026 · 1 mark
CBSE 2026 · Region 5 · Set 3 · Q19
Magnesium ribbon burns with a dazzling white flame and changes into a white powder as shown in the diagram given below :
The powder is dissolved in water. Identify the chemical formula of the white powder and the correct change observed when the solution is tested with litmus paper.
The powder is dissolved in water. Identify the chemical formula of the white powder and the correct change observed when the solution is tested with litmus paper.Official answer
From CBSE’s own marking scheme for this paper.
(B)
MgO , turns red litmus blue.
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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.