The following oxides of nitrogen are given:
(i)   N₂O 
(ii)  NO 
(iii) N₂O₃ 
(iv) NO₂
(v)  N₂O₄
(vi) N₂O₅
If X is the number of neutral oxide and Y is the number of paramagnetic oxide then find the value of $\frac{(\mathrm{X}+\mathrm{Y}{)}^2}{5}$.

(i) N₂O        Neutral     Diamagnetic
(ii) NO        Neutral      Paramagnetic
(iii) N₂O₃     Acidic       Diamagnetic
(iv) NO₂      Acidic       Paramagnetic
(v) N₂O₄     Acidic       Paramagnetic
(vi) N₂O₅    Acidic       Diamagnetic
X = 2,Y = 2
$\therefore (\mathrm{X}+\mathrm{Y}{)}^2=\frac{(4{)}^2}{5}=3.2$