Ncert Exercises & Solutions

Match the items given in Column I with the items given in Column II.

Column I	Column II
A. Mg in solid state	1. p-type semiconductor
B. MgCl₂ in molten state	2. n-type semiconductor
C. Silicon with phosphorus	3. Electrolytic conductors
D. Germanium with boron	4. Electronic conductors

Codes

	A	B	C	D
1.	2	3	4	1
2.	1	2	3	4
3.	1	4	3	2
4.	4	3	2	1

Hint: The conductivity of semiconductors is increased by adding an appropriate amount of suitable impurity. This process is called doping.

A. Mg in solid-state shows electronic conductivity due to the presence of free electrons hence, they are known as electronic conductors.

B. MgCl₂ in the molten state show electrolytic conductivity due to presence of electrolytes in molten state.

C. Silicon doped with phosphorus contain one extra electron due to which it shows conductivity under the influence of electric field and known as n-type semiconductor.

D. Germanium doped with boron contain one hole cue to which it shows conductivity under the influence of electric field and is known as a p-type semiconductor.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions