Abstract

Synopsis 1. Introduction 2. Reduction of (S 2 O 2- 8 + Ag 1 ) system in acid solutions. Competence of intermediate SO - 4 to react with H 2 O/substrate/Ag I leading to a variation in the stoichiometry and mechanism. (a) Oxidation of (b) Oxidation of Ce' (c) Oxidation of hyponitrous acid (H 2 N 2 O 2 ) 3. Reactions of hydrazine in acid solutions. Competence of hydrazyl radical (N 2 H 3 ) to get dimerized and decomposed/oxidised leading to a variation in the stoichiometry and mechanism. (a) Oxidation by Ce (b) Oxidation by TI III 4. Reactions of hydroxylamine. Ratio of the initial reactant-concentrations deciding the stoichiometry and mechanism. Intermediates sensitive to light. (a) Oxidation by peroxomonophosphoric acid (H 3 PO 5 ) in acid solutions (b) Oxidation by TI III in acid solutions (c) Oxidation by Fe III in buffered solutions 5. Reactions of hyponitrous acid. Competence of intermediatee oxyhyponitrous acid (H2N 2 O 3 ) and HNO 2 to decompose/get oxidised leading to a variation in the stoichiometry and mechanism. (a) Oxidation by TI III in acid solutions (b) Oxidation by Ce in acid solutions (c) Oxidation by iodine in buffered solutions (d) Oxidation by Fe(CN) 3- 6 in alkaline solutions 6. Complicated analysis in a simple system of TI III -Sb III in acid perchlorate solutions for 1 : 1 stoichiometry.

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