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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 3 · Q25
Write balanced equations for the reactions of the following: 2 × 1=2 (a) Iron with steam (b) Calcium with water
Write balanced equations for the reactions of the following : $\displaystyle 2 \times 1=2$
(a)
Iron with steam
(b)
Calcium with water
Marking-scheme solution
(a) \(\displaystyle 3 \mathrm{Fe}(\mathrm{s})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}(\mathrm{~s})+4 \mathrm{H}_{2}(\mathrm{~g})\)
(b) \(\displaystyle \mathrm{Ca}(\mathrm{s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\)
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