Which of the following oxides is paramagnetic?

• A

  $\mathrm{SO}_2$
• Correct answer
  B

  $\mathrm{NO}_2$
• C

  $\mathrm{SiO}_2$
• D

  $\mathrm{CO}_2$

Solution

$\text { Presence of unpaired electron in } \mathrm{NO}_2 \text { results in paramagnetic character. }$

Hence, the correct answer is option: 'B'.