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Indicate the species which are oxidised ...

Indicate the species which are oxidised and reduced in the following reactions:
(a) `CN^(Ө) + OCl^(Ө) rarr N_(2)+HCO_(3)^(Ө) + Cl^(Ө)`
(b) `C_(6)H_(5)OH + O_(3) rarr CO_(2)+H_(2)O + O_(2)`
( c) `I^(Ө) + O_(3) rarr O_(2) + I_(2)`
(d) `S_(2)O_(3)^(2-) + Cl_(2) rarr HSO_(4)^(Ө) + Cl^(Ө)`
(e) `C + ZnO rarr Zn+CO`

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The correct Answer is:
A
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