SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Synthesis (or combination)
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Decomposition
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Single displacement
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Double displacement
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Detailed explanation-1: -Photolysis is the decomposition or separation of molecules from a compound caused by the action of light. The given reaction is an example of a decomposition reaction as Calcium carbonate decomposes into two new products i.e. Calcium oxide and Carbon dioxide.
Detailed explanation-2: -(a) Decomposition: A substance breaks down to smaller species. [e.g. CaCO3(s) → CaO(s) + CO2(g) Decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating.]
Detailed explanation-3: -In lime-kiln, the reaction CaCO3⇋CaO+CO2(g) is irreversible. The carbon dioxide gas escapes in the atmosphere. Hence, only forward reaction occurs.
Detailed explanation-4: -Decomposition of CaCO3 is a reversible reaction when carried out in an open kiln.