Assertion : An `N`-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason: An `N`-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavelent impurity.

Explanation

An n-type semiconductor is formed by doping pure germanium or silicon crystal with suitable impurity atoms of valence five. As the impurity atoms take the position of Ge atoms in germanium crystal, its four electrons from convalent bonds by sharing electrons with the neighbouring four atoms of germanium whereas the fifth electron is left free. since the atom on the whole is electrically netural, the n-type semiconductor is also neutral.