Question

nh3 is strong base but nf3 is does not show any basic property. explain​

Answer 1

• A Lewis base must have an electron pair that can be donated to the Lewis acid.  
• NF3 consists of the fluorine ion, which is the most electronegative ion. The fluorine ion tends to pull the lone pair of electrons away from the N.
• Thus, it decreases the electron density surrounding N.
• Hence, unlike NH3, there are no electron pairs that can be donated to the Lewis acid.