Solid State Chemistry Class 12 Important Questions with Answers pdf
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Question 11.
What type of semiconductor is obtained when silicon is doped with arsenic?
Answer:
n-type semiconductor.
Question 12.
Write a distinguishing feature of metallic solids.
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?
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?
Answer:
Interstitial defect in crystals increases the density of a solid.
Question 15.
What is meant by ‘doping’ in a semiconductor?
Answer:
Addition of a suitable impurity to a semiconductor to increase its conductivity is called doping.
Question 16.
Write a point of distinction between a metallic solid and an ionic solid other than metallic lustre.
Answer:
Metallic solid conducts electricity in solid state but ionic solids do so only in molten state or in solution or metals conduct electricity through electrons and ionic substances through ions. Metallic solids are malleable and ductile while ionic solids are hard and brittle.
Question 17.
How may the conductivity of an intrinsic semiconductor be increased?
Answer:
The conductivity is increased by adding an appropriate amount of suitable impurity. This process is called as intrinsic doping.
Question 18.
Which stoichiometric defect increases the density of a solid?
Answer:
Interstitial defect increases the density of a solid.
Question 19.
What are n-type semiconductors?
Answer:
n-type semiconductor : They are obtained by doping silicon with an element of group15, like P, As etc.
Question 20.
What type of stoichmetric defect is shown by AgBr and Agl ?
Answer:
AgBr shows both Frenkel defect and Schottky defect whereas Agl shows Frenkel defect.