Dheeraj observed that the colour of walls of his house changes gradually into shiny white after white wash. He asked you, why did the colour changed into bright white.
Predict the reason.

Rajesh cut the apple, after sometime he observed brown colour on the apple pieces. Predict the reason.

What is the reason for colour change in tomatoes? (green-white-yellow- red)

On keeping iron nails in a blue coloured copper sulphate solution, it is observed that the colour of the solution turns light green after sometime. Give reasons for this colour change. Name the type of reaction.

A student added zinc strip to a solution of CuSO_4 . After several minutes, he observed that the blue colour of solution changed and a layer got deposited on zinc strip. The colour of the solution and that of the coating would respectively be ______

A student added zinc strip to a solution of CuSO_4 . After several minutes, he observed that the blue colour of solution changed and a layer got deposited on zinc strip. The colour of the solution and that of the coating would respectively be ______

___gas changes the colour of lime water into milky white.

The colour of mercurous chloride changes from white to black when treated with ammonia solution. Explain.