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Indicate in the following reactions whic...

Indicate in the following reactions which of the reactants, if any, are oxidised or reduced:
a. `2HI(aq)+Cl_(2)(aq) rarr I_(2)(s) + 2HCl(aq)`
b. `2MnO_(2) + 4Al rarr 3Mn +2Al_(2)O_(3)`
c. `2MnO_(4)^(Ө) + 10Cl^(Ө) + 16H^(o+) rarr 2Mn^(2+) + 5Cl_(2) + 8H_(2)O`
d. `2Cu^(2+)+2Br^(Ө)+SO_(2)+H_(2)Orarr 2CuBr+4H^(o+)`

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