What is the formula of carnallite?

Explanation

Doping: It is a process of mixing pure silicon or germanium with an impurity.
Semiconductors are of two types. They are
(1) Intrinsic semiconductors ..
(2) Extrinsic semiconductors.
(1) Intrinsic semiconductors : In this type of semiconductors, electrical conductivity increases with risein temperature, since more electrons can jump to conduction band. Eg: Silicon and Germanium,
(2) Extrinsic semiconductors : In this type of semiconductors, conductivity is increased by adding a appropriate amount of suitable impurity. This process is called doping. Doping can be done with an impurity which is electron rich or electron deficient. These are of two types.
(a) n - type semiconductors : The semi-conductors in which the increase in conductivity is due tp the negatively charged electron are, called n-type semiconductors.
(b) p - type semiconductors : Tfie semi-conductors in which the increase in conductivity is due to the positively charged holes are called p - type semi-conductors.