93. Solving a chemistry problem
106. Reactions are expressed by schemes:
K2S H2SO4 KMnO4 →MnSO4 K2SO4 H2O S
HNO3 Ca →Ca(NO3)2 H2O NH4NO3
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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