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Science · 2025 · 1 mark
CBSE 2025 · Region 6 · Set 3 · Q1
Example of thermal decomposition reaction are (i) 2 AgCl → 2 Ag + Cl_2 (ii) CaCO_3 → CaO + CO_2 (iii) 2 H_2 O → 2 H_2+ O_2 (iv) 2 KClO_3 → 2 KCl +3…
Example of thermal decomposition reaction are
(i)
$\displaystyle 2 \mathrm{AgCl} \rightarrow 2 \mathrm{Ag}+\mathrm{Cl}_{2}$
(ii)
$\displaystyle \mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}$
(iii)
$\displaystyle 2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{2}+\mathrm{O}_{2}$
(iv)
$\displaystyle 2 \mathrm{KClO}_{3} \rightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2}$
Official answer
(D)
(ii) and (iv)
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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.