Question

How Neha can determine that chemical reaction has happened ?

(1) Change in state /

(2) Change in Colour /

(3) Liberation of gas /

(4) All of above /​

Answer 1

Answer:

3) all of the above

Explanation:

hope it helps...

Answer 2

Following observations helps us to determine whether a chemical reaction has taken place:

1. Change in state

2. Change in colour

3. Evolution of a gas

4. Change in temperature.

So, the answer is All of above.

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