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1. State the oxidation state of the central atom in the following species: (a) SiBr4 (b) Cr(NH3)6Cl3 (c) NO3- (d) PO4^3- 2. Balance the following oxidation-reduction reaction in acidic solution: MnO4- + C2O4^2- >>>>>>>>>>>>> Mn2+ + CO2 3. In general, analogous bonds weaken down a periodic group, whereas for dihalogen molecules, X2 we find the following bond strengths: F-F 158; Cl-Cl 242; Br-Br 193; I-I 151 kJ mol-1 Comment on the reason for the normal trend and the exceptional value for F2? 4. Draw all possible isomers of: (a) [Co(NH3)3Cl3] (b) [Ni(PMe3)(PEt3)Cl2]
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