Sodium 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 a solution called lime water. Which among the following is 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 7
(iv) the pH of the resulting solution will be less than 7
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[B] (ii) & (iii)
Remember you can write, as an example of exothermic reaction is “Slaking of lime” because a large amount of heat is produced during the reaction. We can feel the heat energy by touching the beaker from the outside. It easily turns indicators (red litmus) solution to blue and hence proves that it to be a basic solution. Hence the pH of the solution will be more than 7. You should go with the option [B] as an answer.