92. Solving a chemistry problem
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92. Solving a chemistry problem
118. Pick up the coefficients in the schemes of redox reactions. Specify the oxidizing agent and reducing agent.
18. K H2SO4 = K2SO4 S H2O
43. Na2SO3 = Na2S Na2SO4
68. H2O2 HIO3 = I2 O2 H2O
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