1.

How do we come to know that a chemical reaction has taken place?

Answer»

Solution :The presence of any of the following changes helps us to determine that a chemical REACTION has taken place.
(i) FORMATION of new substance(s) (II) Change in STATE
(iii) Change in colour (iv) Change in temperature
(v) Formation of a precipitate (vi) Evolution of a gas
For example, if on mixing two substances a gas is evolved, then we can say that a chemical reaction has taken place.


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