3. Balance the following Oxidation-Reduction equations: (10%)
a. ____ PbS(s) + ____ O2 (g) →____ PbO (s) + ____ SO2(g)
b. ____ H+(aq)+ ____Cr2O72- (aq) + ____ C2H5OH (l)→ ____ Cr3+(aq)+ ____ H2O (l)+____CO2(g)
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3. Balance the following Oxidation-Reduction equations: (10%)
a. ____ PbS(s) + ____ O2 (g) →____ PbO (s) + ____ SO2(g)
b. ____ H+(aq)+ ____Cr2O72- (aq) + ____ C2H5OH (l)→ ____ Cr3+(aq)+ ____ H2O (l)+____CO2(g)