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Science · 2025 · 3 marks
CBSE 2025 · Region 6 · Set 1 · Q27
Write balanced chemical equation for the reactions that occur when (a) steam is passed over red hot iron. (b) natural gas is burnt in air. (c)…
Write balanced chemical equation for the reactions that occur when
(a)
steam is passed over red hot iron.
(b)
natural gas is burnt in air.
(c)
glucose reacts with oxygen in the cells of our body and provides energy.
Marking-scheme solution
(a) \(\displaystyle 3 \mathrm{Fe}+4 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}+4 \mathrm{H}_{2}\)
(b) \(\displaystyle \mathrm{CH}_{4}+2 \mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O}\)
(c) \(\displaystyle \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \longrightarrow 6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O}+\) Energy
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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.