Answer:- Non polar
Explanations:- If the electron negativity difference is less than 0.4 then the bond is non polar.
From given information, Boron electron negativity is 2.0 and for hydrogen it is 2.1.
So, the difference of these two values = 2.1 - 2.0 = 0.1
The difference is just 0.1 which is less than 0.4 and so the boron trihydride is non polar.
Also, it is a trigonal planar molecule and this also makes it non polar.
