CBSE 2025 · Region 6 · Set 1 · Q27 · 3 marks
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.
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
Chemical Reactions and EquationsWriting and Balancing Chemical EquationsApplyshort_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.