Question

an example of a reaction colour change is noticed

Answer 1

When ammonia is passed over heated copper oxide. The colour of copper oxide changes from black to reddish brown due to the formation of copper. Ammonia is a reducing agent.

# A student of class 10.
#Hope it helps.

Answer 2

Heya friend
Here's your answer.
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When water reacts with anhydrous copper chloride. It turn from blue to pink.
Here's the reaction.
2H2O+CuCl--->CuCl.2H2O
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