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b) 2 Cr(OH)₃ ---> Cr₂O₃ + 3 H₂O
c) SnO₂ + 2 H₂S ---> SnS₂ + 2 H₂O
d) 2Mg + CO₂ ---> 2MgO + C
e) Na₂S ---> 2Na + S