Question

9. When we add water to the following substan
which one will show a chemical change ?
(a) salt
(b) sugar
(c) oil ,
(d) quick lime
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Answer 1

(d) Quick lime is the answer...

Answer 2

Hi there!

(4) - Quick lime.

Quick lime will show a chemical change. When we add water to it, it gives Slaked lime which is highly exothermic.

CaO+H₂O₋₋₋> Ca(OH)₂

This reaction cannot be reversed by any physical or chemical method.

Hence, this reaction will show a chemical change.

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If we add water to salt, sugar and oil so, they can be reversed by physical or chemical method.

We can separate salt from water by evaporation and sugar by distillation and oil by separating the funnel method.