Solution of task 240 of Chemistry Book Shimanovich 2003

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240. Can oxidation-reduction reactions occur between substances:
A) PH3 and HBr;
B) K2Cr2O7 and H3PO3;
C) HNO3 and H2S? Why?
On the basis of the electronic equations, arrange the coefficients in the reaction equation, following the scheme:
AsH3 + HNO3 - H3AsO4 + NO2 + H2O


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