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Question

The oxide, which cannot act as a reducing agent is:

A
CO2
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B
ClO2
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C
NO2
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D
SO2
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Solution

The correct option is A CO2
(a) Oxidation state of C in CO2 is +4. Since, carbon is in its maximum oxidation state of +4, therefore, carbon dioxide (CO2) cannot act as a reducing agent.
(b) Oxidation state of Cl in ClO2 is +4. Since, chlorine is not in its maximum oxidation state, therefore, (ClO2) can act as a reducing agent.
(c) Oxidation state of N in NO2 is +4. Since, nitrogen is not in its maximum oxidation state, therefore, (NO2) can act as a reducing agent.
(d) Oxidation state of S in SO2 is +4. Since, chlorine is not in its maximum oxidation state, therefore, (SO2) can act as a reducing agent.

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