Why is an extrinsic semiconductor electrically neutral

Statement I: By doping silicon semiconductors with pentavalent material, the electrons density increases.

Statement II: The $n-$type of semiconductor has a net negative charge.

In the above statements, choose the most appropriate answer from the options given below:

With reference to semi-conductors answer the following$:$

$\left(\mathrm{iii}\right)$ What is meant by doping?

In an N-type semiconductor, there are:

With reference to semi-conductors answer the following$:$

$\left(\mathrm{ii}\right)$ Name the majority charge carriers in n$‐$type semi$‐$conductor.

When $Si$ is doped with $B$, what will be the type of resulting semiconductor? Will it possess overall charge neutrality? Under what condition $n_e{n}_h=n_i^2$?