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Solid calcium oxide reacts vigorously wi...

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 are true about slaking of lime and the solution formed?
(i) It is an endothermic reaction.
(ii) It is exothermic reation.
(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)`

Text Solution

Verified by Experts

The correct Answer is:
B
It is an exothermic reaction because heat is given out and the resulting compound is `Ca(OH)_(2)` which is basic in nature so, the pH of the resulting solution will be more than seven.
`underset("oxide")underset("Calcium")(CaO)+H_(2)Orarrunderset(("basic"))underset("hydroxide")underset("Calcium")(Ca(OH)_(2))+"heat"`
`Ca(OH)_(2)` turns red litmus solution to blue. So, its pH value is greater than seven.
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Read the given passage and answer the questions. Suhana wanted her house to be white washed, She bought 10 kg of quicklime from the market and dissolved it in 30 L of water. On adding lime to water, she observed that the water started boiling even when it was not being heated. Which of the following statements is correct about the above reaction based on your observations? (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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