(i)Displacement

Using Chlorine water-Yellow colour of chlorine water fades in all test tubes   except with sodium chloride.

 -Colourless Solution formed.

Using Bromine water-Yellow colour of bromine water fades in  test tubes containing sodium iodide.

    -Coloured Solution formed.

The halogens displace each other from their solution.

The more electronegative displace the less electronegative from their solution.

  Chlorine is more electronegative than bromine and iodine.

On adding chlorine water, bromine and Iodine are displaced from their solutions by chlorine.

Bromine is more electronegative than iodide but less 6than chlorine.

On adding Bromine water, iodine is displaced from its solution but not chlorine.

 Uses of halogens

• Florine – manufacture of P.T.F.E (Poly tetra fluoroethene) synthetic fiber.

Reduce tooth decay when added in small amounts/quantities in tooth paste