Solid calcium oxide reacts vigorously with water to form calcium
hydroxide accompanied by liberation of heat. This process is called
slaking of lime. Which among the following is (are) true about
slaking of lime?
(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

NCERT Class X
Science - Exemplar Problems

Chapter_SAMPLE QUESTION PAPER-I

1

Answers

2015-06-01T17:13:26+05:30
(b) ii and iii
Because,
In an exothermic reaction heat is liberated out or released.
The pH level which is more than 7 is base and calcium hydroxide which is the product of the reaction is a base.
0