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Solution of task 227 of Chemistry Book Shimanovich 2003

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227. Reactions are expressed by schemes:
HNO3 + Ca-NH4NO3 + Ca (NO3) 2 + H2O
K2S + KMnO4 + H2SO4 - S + K2SO4 + MnSO4 + H2O
Compose electronic equations. Arrange the coefficients in the reaction equations. For each reaction, indicate which substance is an oxidizer, which is a reducing agent; What substance is oxidized, what is recovered.

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