CBSE Class 10 Science 2020 · Paper 31(B) · Question 15
A small amount of quicklime is added to water in a glass beaker.
- (a)Name and define the type of reaction that has taken place.
- (b)Write the chemical equation for the above reaction.
- (c)List two main observations of this reaction.
Answer
It is a combination reaction: quicklime and water form calcium hydroxide, releasing heat, so the beaker becomes hot.
(a) Combination reaction: a reaction in which two or more substances combine to form a single product. Here calcium oxide and water combine to form calcium hydroxide; since heat is released, it is also an exothermic reaction.
(b)
(c) The quicklime reacts vigorously with the water, often with a hissing sound, and a large amount of heat is released, so the beaker becomes hot.
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