SOLID-STATE-QUIZ-11

Solid State Quiz-11

Dear Readers,

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Q1. Which one of the following is a covalent crystal?

•  Rock salt
•  Ice
•  Quartz
•  Dry ice

Solution
Ice

Q2.In a face centred cubic cell, an atom at the face centre is shared by :

•  4 unit cells
•  2 unit cells
•  1 unit cell
•  6 unit cells

Solution
The fcc unit cell has 8 atoms at the eight corners and one atom at each of six faces. The atom at the face is shared by two unit cells.

Q3.  What is the coordination number of body centred cube?

•   8
•  6
•  4
•  12

Solution
The unit cell of body centred cube has one atom at each of the eight corners and one atom at the centre of the body. Thus, the atom at centre remains in contact with 8 corner atoms. Hence, the coordination number of bcc is 8.

Q4. Which is covalent solid?

•  
•  Diamond
•  Graphite
•  All of these

Solution
All are covalent molecules. A covalent solid has atoms as constituent units at lattice points held together by covalent bonds.

Q5.The substance which possesses zero resistance as 0 K :

•  Conductor
•  Super conductor
•  Insulator
•  Semiconductor

Solution
 Electrical resistance of metals decreases with decrease in temperature and becomes zero at zero kelvin. Materials in this state are called super conductors and the phenomenon as super conductivity.

Q6. Amorphous solids:

•  Possess sharp melting points
•  Undergo clean cleavage when cut with knife
• Do not undergo clean cleavage when cut with knife
•  Possess orderly arrangement over long distances

Solution
Amorphous solids neither have ordered arrangement (i.e., no definite shape) nor have sharp melting point like crystals, but when heated they become pliable until they assume the properties usually related to liquids. If is therefore, they are regarded as super cooled liquids.

Q7.A metal crystallises in a bcc lattice. Its unit cell edge length is about 300 pm and its molar mass

aboutWhat would be the density of the metal?

•  3.1
•  6.2
•  9.3
•  12.4

Solution
Given, 

Q8.Which substance shows antiferromagnetism?

•  
•  
•  
•  

Solution
Substances which are expected to be paramagnetic or ferromagnetic on the basis of unpaired electron but actually they possess zero net magnetic moment are called antiferoomagnetic.

Q9.A cubic crystal possesses :

•  9 plane of symmetry
•  13 axis of symmetry
•  1 centre of symmetry
•  All of these

Solution
These are characteristic elements of symmetry of a cubic crystal.

Q10. Which do not form amalgam with Hg?

•  Pt
•  Fe
•  Both (a) and (b)
• None of these

Solution
Both Pt and Fe does not form amalgam with Hg.