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Science · 2026 · 3 marks
CBSE 2026 · Region 1 · Set 2 · Q27
Translate the following statements into chemical equation and then balance them :(a)Water is added to quicklime(b)Burning of natural gas(c)Thermal decomposition of ferrous sulphate
Translate the following statements into chemical equation and then balance them :
(a)
Water is added to quicklime
(b)
Burning of natural gas
(c)
Thermal decomposition of ferrous sulphate
Marking-scheme solution
(a) \(\displaystyle \mathrm{CaO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\) Heat
(b) \(\displaystyle \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})\)
(c) \(\displaystyle 2 \mathrm{FeSO}_{4}(\mathrm{~s}) \xrightarrow{\text { Heat }} \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{SO}_{3}(\mathrm{~g})\)
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.