olid calcium oxide reacts vigorously with water to form calciumhydroxide accompanied by liberation of heat. This process is calledslaking of lime. Which among the following is (are) true aboutslaking 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)
Question
olid calcium oxide reacts vigorously with water to form calciumhydroxide accompanied by liberation of heat. This process is calledslaking of lime. Which among the following is (are) true aboutslaking 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)
Solution
The correct answer is (b) (ii) and (iii).
The slaking of lime is an exothermic reaction, meaning it releases heat. This is the opposite of an endothermic reaction, which absorbs heat. Therefore, statement (ii) is correct and statement (i) is incorrect.
When calcium hydroxide is formed, it is a base and will therefore increase the pH of the solution to more than seven. So, statement (iii) is correct. Since the solution is basic and not acidic, the pH will not be less than seven, making statement (iv) incorrect.
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