Give some examples of redox couple.
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In sulphur dioxide (SO2) and hydrogen peroxide (H2O2), the oxidation states of sulphur and oxygen are +4 and -1 respectively. As these can increase as well as decrease when the compounds take part in chemical reactions, hence they can act as oxidising as well as reducing agents.
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A redox couple may be defined as a combination of the oxidised and reduced forms of the same substance taking part in an oxidation or reduction half reactions. While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agent is their reactions, ozone and nitric acid act only an oxidants.
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