Question

How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?

Answer 1

Electronegativity of an element is a variable property. It is different in different compounds.
Hence, the statement which says that the electronegativity of $N$ on Pauling scale is $3.0$ in all nitrogen compounds is incorrect.
The electronegativity of $N$ is different in $NH_3$ and $NO_2$.