Make up the equations of redox reactions: a) CuS HNO3; b) CoS H2O2 CH3COOH; c) Mn(NO3)2 PbO2 HNO3; d) KI KMnO4 H2SO4. Indicate the oxidizing agent and reducing agent, the direction of electron transfer. Write down from the table the values of the standard potentials of the corresponding redox pairs.

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