Identify from the following reaction the reactants that undergo oxidation and reduction.
a. Fe + S → FeS
b. 2Ag₂O → 4 Ag + O₂ ↑
c. 2Mg + O₂ → 2MgO
d. NiO + H₂ → Ni + H₂O

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Solution

a. Fe + S → FeS
In a reaction, Fe is changing to FeS. That means, iron loses electrons to form FeS. Loss of electron from a substance is called oxidation, so iron undergoes oxidation.

b. 2Ag₂O → 4 Ag + O₂ ↑
In a reaction, silver oxide is changing to silver. That is, oxygen is being removed from silver oxide. Removal of oxygen from substance is called reduction, so silver oxide undergoes reduction.

c. 2Mg + O₂ → 2MgO
In a reaction, magnesium is changing to magnesium oxide. That means, oxygen is being added to magnesium. Addition of oxygen to a substance is called oxidation, so magnesium undergoes oxidation.

d. NiO + H₂ → Ni + H₂O
In a reaction, Nickle oxide is changing to nickle. That is, oxygen is being removed from nickle oxide. Removal of oxygen from substance is called reduction, so nickle oxide undergoes reduction.In a reaction, hydrogen is changing to H₂O. That is,oxygen is being added to hydrogen. Addition of oxygen to a substance is called oxidation, so hydrogen undergoes oxidation.

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