The Solid State Quiz-2
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Q1. In the closest packing of atoms
Solution
(b) For a given radius of anion Radius ratio for OV and TV is as follows: Hence, size of OV is larger than that of TV
(b) For a given radius of anion Radius ratio for OV and TV is as follows: Hence, size of OV is larger than that of TV
Q2.In a hypothetical solid, C atoms are found to form cubical close-packed lattice. A atoms occupy all tetrahedral voids and B atoms occupy all octahedral voids
A and B atoms are of appropriate size, so that there is no distortion in the ccp lattice of C atoms. Now if a plane as shown in the following figure is cut, then the cross section of this plane will look like
A and B atoms are of appropriate size, so that there is no distortion in the ccp lattice of C atoms. Now if a plane as shown in the following figure is cut, then the cross section of this plane will look like
Solution
(c) From figure, it is clear 4 corners and 2 face centers lie on the shaded plane. Therefore, there will be six C atoms, and atoms (marked A) in TVs do not touch other. Fig. (a) is not possible; four atom marked C Fig. (b) is not possible, atoms A in TVs are not shown in figure Fig. (c) is possible, since atoms A in TVs are not touching each other Fig. (d) is not possible, since atoms A in TVs are touching each other
(c) From figure, it is clear 4 corners and 2 face centers lie on the shaded plane. Therefore, there will be six C atoms, and atoms (marked A) in TVs do not touch other. Fig. (a) is not possible; four atom marked C Fig. (b) is not possible, atoms A in TVs are not shown in figure Fig. (c) is possible, since atoms A in TVs are not touching each other Fig. (d) is not possible, since atoms A in TVs are touching each other
Q3. Superconductors are derived from the compounds of
Solution
(a) Factual statement
(a) Factual statement
Q4. An ionic solid crystallizes as a bcc structure. The distance between cation and anion in the lattice is 338 pm. The edge length of cell is
Solution
Option (b)
Option (b)
Q5.Every atom or ion that forms an fcc unit cell is surrounded by
Solution
(a) Look at corner atom of fcc unit cell. A corner atom can support 8 unit cell. In each cube, at a distance of from corner atom, there is a tetrahedral void; it implies each atom is surrounded by eight tetrahedral voids. At the center of edge, there is an octahedral void. Each corner can support six edges and hence it is surrounded by six octahedral voids
(a) Look at corner atom of fcc unit cell. A corner atom can support 8 unit cell. In each cube, at a distance of from corner atom, there is a tetrahedral void; it implies each atom is surrounded by eight tetrahedral voids. At the center of edge, there is an octahedral void. Each corner can support six edges and hence it is surrounded by six octahedral voids
Q6. How many kinds of space lattices are possible in a crystal?
Solution
(d) All factual statements
(d) All factual statements
Q7.A metal crystallizes in bcc lattice. The percent fraction of edge length not covered by atom is
Solution
Option (b)
Option (b)
Q8.In the crystals of which of the following ionic compounds would you expect maximum distance between the centers of the cations and anions?
Solution
Q9.
Solution
Q10. 
Solution
Option (b)
Option (b)
