Question

Solid calcium oxide reacts vigorously with
water to form calcium hydroxide
accompanied by liberation of heat. This
process is called slaking of lime. Calcium
hydroxide dissolves in water to form its
solution called lime water. Which among
the following is are true about slaking of
lime and the solution formed?
(i) It is an endothermic reaction.
(ii) It is 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)​

Answer 1

Answer:

B - Slaking of lime is an exothermic reaction because a large amount heat is produced during the reaction. The heat can be felt by touching the beaker from outside. The resulting compound Ca(OH)2, which is also called slaked lime, turns red litmus solution to blue and hence proves it to be a basic solution.