solid state Quiz-11
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Q1. The yellow colour of and conducting nature produced in heating is due to
Solution
These are characteristics of metal excess defects due to interstitial cation.
These are characteristics of metal excess defects due to interstitial cation.
Q2. Which is ferromagnetic?
Solution
Ferromagnetics are the substances which are strongly attracted in magnetic field and retain magnetism in absence of magnetic field
Ferromagnetics are the substances which are strongly attracted in magnetic field and retain magnetism in absence of magnetic field
Q3. Which arrangement of electrons leads ferromagnetism?
Solution
Ferromagnetism is due to spontaneous alignment of the magnetic dipoles in same direction
Ferromagnetism is due to spontaneous alignment of the magnetic dipoles in same direction
Q4. The unit cell with the structure below refers to……crystal system
Solution
Note that and the conditions for orthorhombic system.
Note that and the conditions for orthorhombic system.
Q5.The fraction of total volume occupies by the atoms present in a simple cube is :
Solution
Volume of cube = Volume of unit cell = ∴ packing density
Volume of cube = Volume of unit cell = ∴ packing density
Q6. In an antifluorite structure, cations occupy
Solution
In antifluorite structure, the anions are oxide ions. The oxide ions form a face centred cubic array and the metal ion (cation) fill half of the tetrahedral voids. .,
In antifluorite structure, the anions are oxide ions. The oxide ions form a face centred cubic array and the metal ion (cation) fill half of the tetrahedral voids. .,
Q7. The structure of is similar to . The co-ordination number of is :
Solution
has 6 co-ordination number (fcc structure).
has 6 co-ordination number (fcc structure).
Q8. The phenomenon in which crystals on subjecting to a pressure or mechanical stress produce electricity is called :
Solution
It is the definition of piezo-electric effect or piezo-electricity.
It is the definition of piezo-electric effect or piezo-electricity.
Q9. The statement that, “It is possible to choose along the three co-ordinate axes unit distance not necessarily of the same length, such that the ratio of there intercepts of any plane in the crystal is given by in where are either integral whole numbers including infinity or fraction of whole number” is known as :
Solution
This is Hauy’s law of rationality of indices
This is Hauy’s law of rationality of indices
Q10. Crystals which are good conductor of electricity and heat are known as :
Solution
Metallic crystals are good conductor of heat and current due to free electrons on them
Metallic crystals are good conductor of heat and current due to free electrons on them
