Occurrence of ammonia

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Ammonia-

Ammonia is present in traces  in atmosphere. It is also found in soil where nitrogenous matter, such as urea decomposes to ammonia. This is also formed by the bacteria decomposition of nitrogenous matter of plants and animals. It is also found in Jupiter and Saturn in abundance. 

                     Ammonia is one of the most important compounds of nitrogen. It was first prepared by Priestly in the year 1774.

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Siemens Ozoniser how Siemens Ozoniser work

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Rutile structure

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Rutile structure: The radius radio is in the range 0.73 to 0.41. in rutile (TiO²) each Ti⁴+ ion is octahedrally surrounded by six O²- ions whereas each other O²- ion is surrounded by only three Ti⁴+ ions arranged at the tree corners of a plane triangle. The Co-ordination number of Ti⁴+ and O²+ ions are 6 and 3, respectively. It is not exactly a close packed structure. Ti⁴+ ions in rutile may however, be considered as forming a sufficiently distorted body centred cubic lattice.           Example  compounds  having radius ratio below 0.41 are SiO² and BeF² but these are only a few. The Co-ordination number of Si⁴+ and Be²+ is four and that of O²- is two. However, these are appreciably co-valent.
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F - block element What are f - block elements

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