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Science · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 2 · Q26
What happens when(i)Calcium carbonate is heated ?(ii)Silver bromide is exposed to sunlight ?(iii)Lead is added to copper (II) chloride solution ? Write balanced chemical equations of the reactions involved in support of your answer. $\displaystyle \mathbf{3} \times \mathbf{1}$
What happens when
(i)
Calcium carbonate is heated ?
(ii)
Silver bromide is exposed to sunlight ?
(iii)
Lead is added to copper (II) chloride solution ? Write balanced chemical equations of the reactions involved in support of your answer. $\displaystyle \mathbf{3} \times \mathbf{1}$
Marking-scheme solution
(i)
Calcium carbonate decomposes to calcium oxide and carbon dioxide.
\(\displaystyle \mathrm{CaCO}_{3}(\mathrm{~s}) \xrightarrow{\text { Heat }} \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g})\)
(ii)
Silver bromide decomposes to silver and bromine by light.
\[2 \mathrm{AgBr}(\mathrm{~s}) \xrightarrow{\text { Sunlight }} 2 \mathrm{Ag}(\mathrm{~s})+\mathrm{Br}_{2}(\mathrm{~g})
\]
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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.