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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 1 · Q25
Read the following passage and answer the questions that follow: One student was comparing the reactivity of different metals for his science…
Read the following passage and answer the questions that follow : One student was comparing the reactivity of different metals for his science project. He added iron filings in four test tubes A, B, C and D containing aqueous solutions of $\displaystyle \mathrm{ZnSO}_{4}, \mathrm{CuSO}_{4}, \mathrm{FeSO}_{4}$ and $\displaystyle \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$.
(i)
In which of the test tubes will he observe the reaction to be the most vigorous and why ?
(ii)
Write a balanced equation for the reaction involved.
Marking-scheme solution
Test tube B
Iron is more reactive than copper, so iron can displace copper from copper sulphate solution.
(ii) \(\displaystyle \mathrm{Fe}(\mathrm{s})+\mathrm{CuSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})\)
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.