Calcium oxide reacts vigorously with water to produce slaked lime CaO(s)+H2O(l)→Ca(OH)2(aq) this reaction can be classified as:

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Solution

In the given reaction.
CaO(s) + H₂O(l) → Ca(OH)₂(aq)
Calcium oxide Water Calcium hydroxide
Part i) : lime (CaO) combines with water to form slaked lime Ca(OH)₂(aq). Hence two substances are combined to form a single substance, therefore it is a combination reaction.
Part ii): When lime is treated with water, lots of energy is evolved, therefore it is an exothermic reaction.
Therefore, the above reaction is classified as both combination and exothermic reaction.

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Question 9

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)

Calcium oxide reacts vigorously with water to produce slaked lime. $CaO (s) + H_{2} O (aq) \to Ca {(OH)}_{2} (aq)$ This reaction can be classified as:

Q. Quicklime

(CaO)

reacts with water to form slaked lime

{Ca(OH)}_{2}

. During this process:

Q. Quicklime

(CaO)

reacts with water to form slaked lime

{Ca(OH)}_{2}

. During this process:

Q. 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

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