Question

9. Assertion : Dissolution of quick lime in water in water is an exothermic redox reaction. Reason : During dissolution of Cao in water there is no change in the oxidation numbers of any elements. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is not correct explanation of A (c) A is correct and R is incorrect (d) A is incorrect and R is Correct

Answer 1

Answer:

Quick lime(CaO) combines with water to form calcium hydroxide(Ca(OH)2). It is an exothermic reaction as heat is produced in the reaction.                                   

CaO+H2O→Ca(OH)2+heat                                             

On  adding excess of calcium hydroxide in water, a saturated solution of calcium hydroxide is formed which is called lime water. Lime water is basic in nature and therefore has a pH above 7.

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Answer 2

Answer:

the ans is a is not correct but b is correct

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