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B
Limestone
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C
Slaked lime
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D
Quicklime
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Solution
The correct option is C Slaked lime (C) Slaked lime
Reaction - CaO + H2O→Ca(OH)2
Reason : Lime or quick lime is chemically calcium oxide(CaO) ,and when it is added to water , then calcium hydroxide (or slaked lime) is formed.This reaction is highly exothermic and a large amount of heat is released in the process.