Question

I want important questions on chapter "THE SOLID STATE"​

Answer 1

Question 1.
Which point defect in crystals does not alter the density of the relevant solid? (Delhi) 2009
Answer:
Frenkel defect.

Question 2.
Which point defect in its crystal units alters the density of a solid? (Delhi) 2009
Answer:
Schottky defect.

Question 3.
Which point defect in its crystal units increases the density of a solid? (Delhi) 2009
Answer:
Metal excess defect increases the density of a solid. It is due to presence of extra cations in the interstitial sites.


Question 4.
How do metallic and ionic substances differ in conducting electricity? (All India) 2009
Answer:
The electrical conductivity in metallic substances is due to free electrons while in ionic substances the conductivity is due to presence of ions.

Question 5.
Which point defect of its crystals decreases the density of a solid? (Delhi & All India) 2009
Answer:
Schottky defect.

Question 6.
What is the number of atoms in a unit cell of a face-centred cubic crystal? (All India) 2009
Answer:
The number of atoms in a unit cell of fcc-crysta! is 4 atoms.


Question 9.
Which point defect in crystals of a solid decreases the density of the solid? (Delhi) 2010
Answer:
Schottky defect.

Question 10.
What type of interactions hold the molecules together in a polar molecular solid? (All India) 2010
Answer:
Dipole-dipole forces of attractions hold the molecules together in a polar molecular solid.

Question 11.
What type of semiconductor is obtained when silicon is doped with arsenic? (All India) 2010
Answer:
n-type semiconductor.



Question 12.
Write a distinguishing feature of metallic solids. (All India) 2010
Answer:
Metallic solids possess high electrical and thermal conductivity due to presence of free electrons.

Question 13.
‘Crystalline solids are anisotropic in nature.’ What does this statement mean? (Delhi) 2011
Answer:
It means that crystalline solids show different values of their some properties like electrical conductivity, refractive index, thermal expansion etc. in different directions.

Question 14.
Which stoichiometric defect in crystals increases the density of a solid? (Delhi) 2011
Answer:
Interstitial defect in crystals increases the density of a solid.

Question 15.
What is meant by ‘doping’ in a semiconductor? (Delhi) 2012
Answer:
Addition of a suitable impurity to a semiconductor to increase its conductivity is called doping.

Answer 2

The important questions on solid states are -

Q1. Which point defect in crystal does not alter the destiny of the relevant solid? A: Frenkel defect.

Q2. Which point defect in its crystal units alters the desity of a solid? A: Schottky defect.

Q3. how do metallic and ionic substances free fire in conducting electricity? A: The Electrical conductivity in metallic substance is due to free electrons while in ionic substances the conductivity is due to presence of ions.

More questions in the image---