SOLID-STATE-QUIZ-8

Solid State Quiz-8

Dear Readers,

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Q1. Which one is diamagnetic?

•  
•  
•  
•  

Solution
 has no unpaired electron and thus, diamagnetic. A diamagnetic does not contain any unpaired electron.

Q2.A fcc unit cell of aluminium contains the equivalent of how may atoms?

•  1
•  2
•  3
•  4

Solution
In fcc atoms are present at faces and corners.

Number of atoms in fcc = atoms at corners + atoms at faces of unit cell. 

                     = (no. of corners × contribution by one atom) + (no. of faces × contribution by one atom)                         =(8×1/8)+(6×1/2)=1+3=4

Q3.  AB crystallises in a bcc lattice with edge length 'a' equal to 387 pm. The distance between two

oppositely charged ions in the lattice is :

•   335 pm
•  250 pm
•  200 pm
•  300 pm

Solution

For a bcc lattice,

Q4. For a solid with the following structure, the co-ordination number of the point B is :

•  3
•  4
•  5
•  6

Solution
It is evident from figure that B occupies tetrahedral voids and thus, co-ordination number is six.

Q5.In a face centred cubic lattice the number of nearest neighbours for a given lattice point are :

•  6
•  8
•  12
•  14

Solution
 Number of sodium ions are 12 at edge centres in fcc structure which are nearest neighbours for a given lattice point.

Q6. Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell

of lithium is 351 pm, the atomic radius of the lithium will be :

•  300.5 pm
•  240.8 pm
• 151.8 pm
•  75.5 pm

Solution

Q7.A metallic element crystallises into lattice containing a sequence of layers of ABABABAB…….

Any packing of spheres leaves out void in the lattice. The empty space in percentage by volume in

this lattice is :

•  26%
•  32%
•  20%
•  30%

Solution
ABABAB…..packing has empty space of 28% in sc, 32% in bcc, 26% in hcp and ccp.

Q8.The radius of ion is 126 pm while that of ion is 216 pm. The co-ordination number

of Ag in AgI is :

•  2
•  4
•  6
•  8

Solution
Radius ratio  Thus, fcc structure and co-ordination no. is six.

Q9.In CsCl type structure the coordination number of and are

•  6, 6
•  6, 8
•  8, 8
•  8, 6

Solution
The coordination number is 8 : 8 in  : 

The coordination number is 6 : 6 in  :

Q10. Which of the following statement is true?

•  Some complex metal oxides behave as superconductor
•  Zinc oxide can act as superconductor
•  An impurity of tetravalent germanium in trivalent gallium creates electron deficiency
• A Frenkel defect is formed when an ion is displaced from its lattice site to an interstitial site

Solution
Frenkel defect is formed by displacement of ion from its lattice to interstitial state.