Column I		Column II
A)	Mg in solid state	i)	p-type semiconductor
B)	MgCl2 in molten state	ii)	n-type semiconductor
C)	Silicon with phosphorous	iii)	electrolytic conductors
D)	Germanium with boron	iv)	electronic conductors

	A	B	C	D
1)	ii	i	iv	iii
2)	i	ii	iii	iv
3)	iii	iv	i	ii
4)	iv	iii	ii	i

(i) Mg in solid state show electronic conductivity due to presence of free electrons hence, they are known as electronic conductors.
(ii) MgCl₂ in molten state show electrolytic conductivity due to presence of electrolytes in molten state.
(iii) Silicon doped with phosphorus contain one extra electron due to which it shows conductivity under the influence of electric field and known as p-type semiconductor.
(iv) Germanium doped with boron contains one hole due to which it shows conductivity under the influence of electric field and known as n-type semiconductor.