Write balanced equation for
(i) The preparation of phosphine from `CaO` and white phosphorus.
(ii) The preparation of ammonium sulphate from gypsum, ammonia and carbon dioxide.

Write balanced equation for (i) The preparation of phosphine from CaO and white phosphorus. (ii) The preparation of ammonium sulphate from calcium sulphate,H2O,ammonia and carbon dioxide.

Write balanced equation for the preparation of urotropine.

Write the equation for the preparation of phosphine.

Write a method of preparation of phosphine from white phosphorus

Give balanced equation for the preparation of salicylaldehyde from phenol.

Write balanced chemical equation for the preparation of methane from iodomethane

Write a balanced chemical equation for the preparation of Ethene from bromoethane.

Write principle and equation for preparation of ammonia from urea.