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Indicate which reactions are redox reactions. Check all that apply. a) Si(s) + O2(g) → SiO2(s) b) 2Na(s) + I2(g) → 2NaI(s) c) Zn (s) + Cu^2+(aq) → Zn^2+(aq) + Cu(s) d) AgNO3(aq) + KI(aq) → AgI(s) + KNO2(aq)