CBSE Class 10 Science 2023 Delhi Set 1

Question : 17 of 39

Marks: +1, -0

Assertion (A) : Reaction of Quicklime with water is an exothermic reaction.
Reason (R): Quicklime reacts vigorously with water releasing a large amount of heat.

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of $( {\A})$ .
(A) is true, but (R) is false.
(A) is false, but (R) is true.

Solution:

When quicklime (calcium oxide) is treated with water, slaked lime is formed with the evolution of a large amount of heat.Thus, this reaction is exothermic in nature.

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