BN is paramagnetic or dimagnetic?

No. of electrons in BN is 12 i.e. 5 from B and 7 from N (5+7=12). Its molecular orbital configuration is :
σ1s² σ*1s^​​² σ2s²​ ​σ*2s^2​ π2p_​y²  π2p_​z²
No. of unpaired electrons=0
Therefore, BN is dimagnetic in nature.