solid state quiz-13

Solid State Quiz-13

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Q1. Which one is diamagnetic?

•  gold
•  silver
•  copper
 platinam

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)

Q3.  crystallises in a bcc lattice with edge length 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 is :

•  3
•  4
•  5
•  6

Solution
It is evident from figure that 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
In bcc.

Q7. A metallic element crystallises into lattice containing a sequence of layers of ……. 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
…..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 in is ::

•  2
•  T4
•  6
•  8

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

Q9. In type structure the coordination number ofand 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. .