What are called electrically charged and electrically neutral bodies?

In Millikan's oil drop experiment, which of the following charges can be present on the oil drop?

Select the correct statement about electric charge.

$A$ body has a charge of $-3.2 \mu C$. The number of excess electrons will be

What is electric charge? Is it a scalar or a vector quantity?

We have three identical metallic spheres $A, B$ and $C$. $A$ is given a charge $Q$,and $B$ and $C$ are uncharged. The following processes of touching of two spheres are carried out in succession. Each process is carried out with sufficient time.
$(i)$ $A$ and $B$
$(ii)$ $B$ and $C$
$(iii)$ $C$ and $A$
$(iv)$ $A$ and $B$
$(v)$ $B$ and $C$
The final charges on the spheres are