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Ethyne or acetylene on reaction with cold K M n O 4 adds 4 O H − to the triple bond. It is oxidised by a dilute aqueous solution of potassium permanganate to form oxalic acid. It is oxidised by a dilute aqueous solution of potassium permanganate to form oxalic acid. Balance the rest of the atoms (H's and O's) using H 2 O. Balance the number of electrons transferred for each half reaction using the appropriate factor so that the electrons cancel. Add the two half-reactions together and simplify if necessary. Example 3. Balance the following redox reaction. Step 1. Determine the oxidation states of the ... Oct 06, 2002 · Most simple redox reactions may be classified as combination, decomposition, or single displacement reactions. In a combinations reaction two reactants react to give a single product. The general format of the chemical equation is. a A + b B + … → c C