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1.
The edge length of a face centred cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anions is
2.
A metal has bcc structure and the edge length of its unit cell is 
The volume of the unit cell in 
will be
The volume of the unit cell in will be
3.
Which one of the following defects in the crystals lowers its density?
4.
The yellow colour of 
and conducting nature produced in heating is due to:
and conducting nature produced in heating is due to:
5.
The radius ratio of 
is 0.93. The expected lattice structure is
is 0.93. The expected lattice structure is
6.
Of the elements 
all of which are in 
period, the paramagnetics are:
all of which are in period, the paramagnetics are:
7.
Metals have conductivity of the order of (
:
:
8.
Among the following types of voids, which one is the largest void?
9.
The crystalline structure of 
is
is
10.
An element has bcc structure having unit cells 
The number of atoms in these cells is :
The number of atoms in these cells is :