Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.

Give reasons for the following : (i) The blue colour of copper sulphate solution is rendered light green when a piece of iron is dropped into it. (ii) Fried potato chips are often packed with nitrogen gas. (iii) Cooked food emits a bad smell when left exposed to air for a day or two.

Identify the type of chemical reaction in the following statements and define each of them : (i) Digestion of food in our body (ii) Rusting of iron (iii) Heating of manganese dioxide with aluminium powder (iv) Blue colour of copper sulphate solution disappears when iron filings are added to it. (v) Dilute hydrochloric acid is added to sodium hydroxide solution to form sodium chloride and water.

The blue colour of copper sulphate solution is discharged when a rod of zinc is deppid in it.Explain.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Lead is added to copper sulphate solution.