Briefly explain (in one or two sentences) the following observations: a. Unlike NH3, BiH3 is very unstable compound. b. Solid SO3 forms a trimer (SO3)3 but solid SeO3 forms a tetramer (SeO3)4. c. NH3 can be obtained from N2 and H2, but PH3 has to be prepared from PCl3 and  LiAlH4

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Coordination Chemistry

It is a part of chemistry, in which the study of compounds that have central atoms surrounded by molecules or ions, known as ligand, is known as coordination chemistry.