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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?…
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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