(Suggest metals P and Q., P : Copper, Q : Zinc, Q : Copper, P : Zinc, Half equations for the reactions in experiment I, Fe2+ → Fe3+ e-, Fe → Fe2+ + 2e-, O2 + 2H2O + 4e- → 4OH-, Pink spot in the test tube shows the present of -------- ion, OH-, Fe2+, Oxidation reaction occurs at------------ plate (anode) , pure copper, impure copper, Impure Copper loses electron to form Cu2+ ion and a ---------- reaction occurs at pure copper plate , oxidation, reduction, Cu2+ ion ------------ to form copper atom., gains electron, donate electron.

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