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Q.

Which of the following cannot act as reducing agent? 

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a

NO2 

b

SO2 

c

CO2 

d

CIO2 

answer is C.

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Detailed Solution

In all the given compounds oxidation number of non metal is + 4. As C belongs to group IV and it is in its maximum oxidation state. So, reduction in oxidation number of nonmetal is not possible only in CO2,. As we know that reduction is always accompained by an increase in 
oxidation number of reducing agent. So, CO2 cannot acts as reducing agent among the given choices. 

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Which of the following cannot act as reducing agent?