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Science · 2025 · 2 marks
Chemical Reactions and EquationsCombination and Decomposition Reactions2 marksRemembervery short answer
CBSE 2025 · Region 4 · Set 2 · Q21
While burning a magnesium ribbon in air, list two safety measures which should be followed. Also state two observations of this activity.
While burning a magnesium ribbon in air, list two safety measures which should be followed. Also state two observations of this activity.
Marking-scheme solution
Safety measures:
A pair of tongs should be used to hold the magnesium ribbon.
Burn the magnesium ribbon keeping it away from eyes. / protective eye glasses should be worn.
Observations:Dazzling white flame is seen.
A white powder or ash is formed.
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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.