CBSE Class 10 Science 2020 · Paper 31/2/1 · Question 15
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’.
- (i)Identify A and B.
- (ii)Write chemical equation for the reaction of A with water.
- (iii)List two types of reaction in which this reaction may be classified.
Answer
A is calcium oxide and B is calcium hydroxide; the reaction is both a combination reaction and an exothermic reaction.
(i) A is calcium oxide, (quicklime); B is calcium hydroxide, (slaked lime).
(ii)
(iii) It is a combination reaction (two reactants form a single product) and an exothermic reaction (heat is released).
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