Sequence of acidic character is

Sequence of acidic character is
  1. $\mathrm{N}_{2} \mathrm{O}_{5}>\mathrm{SO}_{2}>\mathrm{CO}>\mathrm{CO}_{2}$
  2. $\mathrm{N}_{2} \mathrm{O}_{5}>\mathrm{SO}_{2}>\mathrm{CO}_{2}>\mathrm{CO}$
  3. $\mathrm{SO}_{2}>\mathrm{CO}_{2}>\mathrm{CO}>\mathrm{N}_{2} \mathrm{O}_{5}$
  4. $\mathrm{SO}_{2}>\mathrm{N}_{2} \mathrm{O}_{5}>\mathrm{CO}>\mathrm{CO}_{2}$

Solution

The acidic character of non metal oxides increases across a period from left to right and decreases down a group. So, acidic character will follow the order:
oxide of nitrogen $>$ oxides of sulfur $>$ oxides of carbon. Among oxides of carbon acidic character increases with
the oxidation number of carbon. So, ${ }^{+4} \mathrm{CO}_{2}$ is more acidic than CO. Hence the sequence of acidic character is $\mathrm{N}_{2} \mathrm{O}_{5}$ $>\mathrm{SO}_{2}>\mathrm{CO}_{2}>\mathrm{CO}$ *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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