What colour is observed when ZnO is heated ?

What is observe when Zno is heated.

State what is observed when iodine is heated in a test tube

What colour do you observe ?

What is meant by water of crystallization. How many molecules of water are present in hydrated copper sulphate? Write its formula. What colour change do you observe when it is heated?

What change in colour is observed when white silver chloride is left exposed to sunlight? State the type of chemical reaction in this change.

What change of colour is observed when H_2S gas is passed through an acidified aqueous solution of potassium dichromate?

What change in colour is observed when white silver chloride is left exposed to sunlight ? State the type of chemical reaction in this change.

What do you observe when ammonia is passed over heated litharge ?