Identify the substance oxidised and reduced.

a) Fe2O3 + 2Al Al2O3+ 2Fe

b) Mg + 2HCl MgCl2 + H2

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Solution

a) Fe₂O₃ + 2Al ---------> Al₂O₃+ 2Fe

Fe₂O₃ is reduced as it loses oxygen to form iron, Al is oxidised as it gains oxygen.

b) Mg + 2HCl ---------> MgCl₂ + H₂

Here Mg gets oxidised form 0 to +2
and H gets reduced from +1 to 0.

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