Question

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

Answer 1

Option b is the right answer

Answer 2

It is an exothermic reaction and the pH of the resulting solution will be more than seven is true about  Slaking of lime.

Option (b)

Explanation:

• Slaking of lime is an 'exothermic reaction', which means it would create more heat when the reaction occurs. It can be observed by touching the container from outside. The beaker heats up during the reaction.
• Slaking of lime is a base and can turn red litmus blue. So we can say that the pH of slaking of lime will be above the neutral value, more than seven.

Learn more about Slaking of lime

What does slaking lime stand for?Why is there a hissing sound during thus process? write the chemical equation for the reaction envolved

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The suspension of slaked lime in water is known as

a) Lime water

b) Quick lime

c) Milk of lime

d) Aqueous solution of slaked lime

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