CBSE 2025 · Region 4 · Set 2 · Q21 · 2 marks
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.
Chemical Reactions and EquationsCombination and Decomposition ReactionsRemembervery_short_answereasy
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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.