Describe one method of producing high purity hydrogen.

Describe a method of producing plane polarised light.

Describe one method of obtaining cattle breeds.

Distinguish between ortho and para hydrogen Describe one method of preparation of H_2O_2 in the laboratory.

Describe one method for removal of temporary hardness of water.

Describe two methods of preparation of ethylene . Give equation for the reactions of ethylene with the Heated with O _(2) at high pressure

Explain any one method of crop production which ensures high yield.