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Science · 2026 · 3 marks
CBSE 2026 · Region 3 · Set 1 · Q26
2 g of green coloured crystals of ferrous sulphate are heated in a dry boiling tube. Name the type of chemical reaction taking place. Write the…
$\displaystyle 2$ g of green coloured crystals of ferrous sulphate are heated in a dry boiling tube. Name the type of chemical reaction taking place. Write the balanced chemical equation for the reaction. Is this an exothermic or an endothermic reaction?
Marking-scheme solution
Thermal decomposition reaction
\(\displaystyle 2 \mathrm{FeSO}_{4}(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{SO}_{3}(\mathrm{~g})\)
Endothermic reaction
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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.