6(iv)
Identify the reactants P, Q and R in the following reactions:
(a) Copper oxide + P ⟶ Copper + water
(b) Iron pyrite + Q ⟶ Iron oxide + Sulphur dioxide
(c) Sodium chloride + R ⟶ Sodium nitrate + Silver chloride
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(a) Hydrogen
(b) Oxygen
(c) Silver Nitrate