The correct sequence of acidic character is:

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(D) The acidic nature of non-metallic oxides is directly proportional to the oxidation state of the central atom. Calculating the oxidation states: $N

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$N_2O_5 > SO_2 > CO_2 > CO$

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(D) The acidic nature of non-metallic oxides is directly proportional to the oxidation state of the central atom. Calculating the oxidation states: $N_2O_5$: $N$ is $+5$ $SO_2$: $S$ is $+4$ $CO_2$: $C$ is $+4$ $CO$: $C$ is $+2$ Comparing the oxidation states: $+5 > +4 > +4 > +2$. For oxides with the same oxidation state (like $SO_2$ and $CO_2$),the acidic strength depends on the electronegativity of the central atom. Since $S$ is more electronegative than $C$ in this context,$SO_2$ is more acidic than $CO_2$. Thus,the correct order is $N_2O_5 > SO_2 > CO_2 > CO$.

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