When copper sulphate crystals are heated, they lose their colour and turns white. When water is added, they restore their colour. Explain it with proper reason.

When lime water is sprayed on turmeric paper, its colour is

When turmeric is added with lime water it turns in to colour

When we added crystals of potassium permanganate to the water, the colour of water will be changed. What will be the reason for it?

Does the colour of the flower remain the same when soap water is used ?

Acidified dichromate solution turns green when sodium sulphide is added to it. Explain.

A reddish-pink substance on heating gives off a vapour which condences on the sides of the test tube and the substance turns blue. Il on cooling water is added to the residue it turns to its original colour. The substance is :

When heated in bunsen flame, lithium gives colour

When copper powder is heated 'CuO' would be formed. What type of colour changes do you notice?

Which colours do you observe when an iron rod is gradually heated ?

The black coloured substance formed when copper is heated in presence of oxygen.