Balance the equations below assuming they occur in an acidic solution. (a) H2 O2 + Sn^2+ ⟶ H2 O + Sn^4+ (b) PbO2 + Hg ⟶ Hg2^2+ + Pb^2+ (c) Al + Cr2 O7^2− ⟶ Al^3+ + Cr^3+

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