4. Solving a chemistry problem
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349. Select the coefficients for the equations of redox reactions using the method of electron-ion balance (half-reaction method), indicate the oxidizing agent and reducing agent.
349 PbO2↓ Mn(NO3)2 HNO3→Pb(NO3)2 HMnO4 H2O
349 PbO2↓ Mn(NO3)2 HNO3→Pb(NO3)2 HMnO4 H2O
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