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.

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (iii) and (iv)

Answer

B

Explanation

Slaking of lime an exothermic process. Lime (CaO) dissolves in water to form calcium hydroxide called slaked lime `Ca(OH)_(2)`. Since it is a base, the pH of solution will become more than seven (7). For details, consult (Section 2.6) chapter 2.