157 Reactions are expressed by schemes.
HNO3 Ca  NH4NO3 Ca(NO3)2 H2O,
K2S KMnO4 H2SO4  S K2SO4 MnSO4 H2O.
Write electronic equations. Arrange the coefficients in the reaction equations. For each reaction, indicate which substance is the oxidizing agent, which is the reducing agent; which substance is oxidized and which is reduced.

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