Question: 3. (a) (b) What is the structural unit of silicate minerals? Give the formula and the geometric structure. Show, with at least one example of

3. (a) (b) What is the structural unit of silicate minerals?

3. (a) (b) What is the structural unit of silicate minerals? Give the formula and the geometric structure. Show, with at least one example of each, the structural types which are formed for silicates with: (1) an O/Si ratio of 2, (ii) an O/Si ratio of 2.5, and (iii) an O/Si ratio of 2.75. (c) (1) Determine the number of Mo-Mo bonds in the stable compound [Mod 5-Cp)(CO)2]2. Explain your answer. What is the oxidation number of Mo? (ii) (d) (e) How is metal to ligand 1-backbonding to PR3 modified as a function of R- group? Give two relevant examples illustrating this modulation. (0) The brown ring reaction is used as a spot test for nitrate. The nitrosyl product formed is either [Fe(111)(H20)(NO)]2+ or [Fe(1(H2O): (NO)}+. Explain how IR spectroscopy as well as X-ray crystallography may be used to distinguish between these two ions. (ii) How does isotopic labelling with 170 affect the observations of (1)? Explain your

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