5. Make redox reaction equations: a) oxidation of manganese sulfate with red lead in a nitric acid medium; b) oxidation of chromium(III) with potassium permanganate in an acidic medium; c) interaction of Na2S with KMnO4 in an acidic medium; d) oxidation of bismuth sulfide with nitric acid. Write the standard redox potentials of pairs. Calculate the EMF of the reactions. What is the application of these reactions in qualitative analysis?

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