Question

A compound 'A' is used in the manufacture of cement. When dissolved in
water, it evolves a large amount of heat and forms compound 'B'.
(1) Identify A and B.
6) Write chemical equation for the reaction of A with water.
(i) List two types of reaction in which this reaction may be classified.
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Answer 1

Explanation:

A is CaO and B is CaO(OH)2

CaO+H2O gives Ca(OH)2+ heat

combination and exothermic reaction

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