OBJECTIVE LIFE SCIENCE
ECOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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name this reaction, Ca + O
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Decomposition
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Single Replacement
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Double Replacement
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Combustion
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Explanation:
Detailed explanation-1: -The reaction of quick lime(CaO) with water to form lime water Ca ( OH ) 2 is an example of a combination reaction and the nature of the reaction is exothermic. Combination reaction: The reaction in which two or more than two substances combine to form one single substance is called a combination reaction.
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: -CaO + H2O → Ca(OH)2 This reaction is strongly exothermic and takes place vigorously with the formation of clouds of steam.
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