Question
Identify from the following reactions the reactants that undergo oxidation and reduction.
✓
Answer
$(a) Fe + S \rightarrow FeS \rightarrow Fe$ undergoes oxidation and $S$ undergoes reduction.
$(b) 2Ag_2O \rightarrow 4Ag + O_2↑ \rightarrow $ Silver oxide undergoes reduction.
$(c) 2Mg + O_2\rightarrow 2MgO \rightarrow $ Mg undergoes oxidation and oxygen undergoes reduction.
$(d) NiO+H_2 \rightarrow Ni + H_2O \rightarrow $ Redox reaction.
In the above equation, reactant $NiO$ (Nickel oxide) loses oxygen, thus undergoes reduction whereas $H_2$ (Hydrogen gas) gains oxygen forming water and undergoes oxidation.
$(b) 2Ag_2O \rightarrow 4Ag + O_2↑ \rightarrow $ Silver oxide undergoes reduction.
$(c) 2Mg + O_2\rightarrow 2MgO \rightarrow $ Mg undergoes oxidation and oxygen undergoes reduction.
$(d) NiO+H_2 \rightarrow Ni + H_2O \rightarrow $ Redox reaction.
In the above equation, reactant $NiO$ (Nickel oxide) loses oxygen, thus undergoes reduction whereas $H_2$ (Hydrogen gas) gains oxygen forming water and undergoes oxidation.
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