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1.
Which of the following statements is not correct?
2.
In a cubic structure of diamond which is made from 
and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is
and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is
3.
The cation-anion bond have the largest amount of covalent character for:
4.
In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere is :
5.
Sodium metal crystallizes in a body centred cubic lattice with the cell edge 
. The radius of sodium atom is :
. The radius of sodium atom is :
6.
Schottky defects occurs mainly in electrovalent compounds where
7.
What type of crystal defect is indicated in the diagram below?
8.
An ion leaves its regular site occupy a position in the space between the lattice sites is called
9.
If 
is dopped with 
mole % of 
the concentration of cation vacancies will be:
is dopped with mole % of the concentration of cation vacancies will be:
10.
The structure of 
is similar to . The co-ordination number of 
is :
is similar to . The co-ordination number of is :