Question

Give an example of chemical change in which there is a change of colour that takes place

Answer 1

When a few pieces of iron are dropped into a blue coloured copper sulphate solution ,the blue colour of the solution fades and eventually turns into ligh green due to the formation of ferrous sulphate.
Fe+cuso4------------feSo4+cu

Answer 2

Browning of fruits and vegetables are the chemical change.