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  4. Which of the following acts as a reducing agent?

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Q. Which of the following acts as a reducing agent?

Redox Reactions

Solution:

The O.N, of $C$ increases from $+ 3$ in $(COOH)_2$ to $+4$ in $CO_2$, therefore, it acts as a reducing agent
$(C^{+3} OOH)_2 \rightarrow 2C^{+4}O_2$
In all the remaining compounds, one element has already the maximum possible O.N., i.e., $N$ has $+ 5$ in $HNO_3$, $Mn$ has $+ 7$ in $KMnO_4$ and $S$ has $+ 6$ in $H_2SO_4$ and they cannot further increase their G.N. and hence cannot act as reducing agents.