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Solid State Quiz-11

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The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

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.

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