Which of the following statements is correct? 

${\mathrm{N}}_2\mathrm{O}$  is laughing gas but linear in shape ${\mathrm{NO}}_2$ has pungent 

odour and angular in shape. NO is colourless gas and neutral

 $2{\mathrm{NO}}_2+2\mathrm{NaOH}⟶{\mathrm{NaNO}}_2+{\mathrm{NaNO}}_3+{\mathrm{H}}_2\mathrm{O}$