389. The reaction is expressed by the schemes:
K2Cr2O7 SnCl2 HCl = SnCl4 CrCl3 KCl H2O,
Mg HNO3(p) = Mg(NO3)2 N2O 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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