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Science · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 2 · Q28
Study the experimental set-up given in the figure and answer the following questions: (a) Identify these metals from the following which can be used…
Study the experimental set-up given in the figure and answer the following questions :
(a)
Identify these metals from the following which can be used as "metal sample" in the given set-up : Aluminium, Copper, Iron, Lead, Silver
(b)
Write balanced chemical equations for the reaction in each case.
Marking-scheme solution
(a)
Aluminium (Al) and Iron (Fe)
(b)
\(\displaystyle 2 \mathrm{Al}+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2}\)
\(\displaystyle 3 \mathrm{Fe}+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}+4 \mathrm{H}_{2}\)
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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.