Problem: Indicate which reactions are redox reactions.(a) Hg2(NO3)2(aq) + 2 KBr(aq) → Hg2Br2(s) + 2 KNO3(aq)(b) 4 Al(s) + 3 O2(g) → 2 Al2O3(s)(c) CaO(s) + CO2(g) → CaCO3(s)

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(a) Hg2(NO3)2(aq) + 2 KBr(aq)  Hg2Br2(s) + 2 KNO3(aq)

Reactants:

O.S. K = +1

O.S. Br = -1

O.S. O = -2

O.S. N = +5

O.S. Hg = +1 

Products:

O.S. K = +1

O.S. Br = -1

O.S. O = -2

O.S. N = +5

O.S. Hg = +1 


(b) 4 Al(s) + 3 O
2(g)  2 Al2O3(s)

Reactants:

O.S. Al = 0

O.S. O = 0

Products:

O.S. O = -2

O.S. Al = +3


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Problem Details

Indicate which reactions are redox reactions.
(a) Hg2(NO3)2(aq) + 2 KBr(aq) → Hg2Br2(s) + 2 KNO3(aq)
(b) 4 Al(s) + 3 O2(g) → 2 Al2O3(s)
(c) CaO(s) + CO2(g) → CaCO3(s)

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