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 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)​

Answer 1

Answer:

A

C

Explanation:

Answer 2

The statements that are true:

1. It is an exothermic reaction, since it liberates energy in the form of heat

2. The pH will be more than 7, since CaO is basic in nature, and will form an alkaline solution with water, making its pH greater than 7

So, the correct option is: b) ii) and iii)

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