solid state quiz 2

1 Gold has sharp Melting point it is..

• Crystalline solid

• Molecular solid

• Amorphous solid

• Covalent solid

Solid A shows same value of electrical resistance in all directions , it is

• Crystalline solid

• Molecular solid

• Amorphous solid

• Covalent solid

-------tetrahedral and octahedral voids are there in cubic unit cell respectively

• 2N & N

• N & 2N

• 3N & N

• N&N

4. The percentage occupied by voids in BCC type of unit cell will be -------

• 32%

• 68%

• 74%

• 42%

The contribution from various lattice site in cubic unit cell is given. which is incorrect?

• Corner—1/8

• Face --- 1/6

• Body --- 1

• Edge --- 1/4

The coordination no. in ccp and hcp unit cell is

• 8

• 12

• 4

• 2

CaCl₂ shows a defect .Its density decreases. It has …………..defect

• Frenkel

• Cation vacancy

• Vacancy

• Schottky

--------------- shows both schottky and frenkel defect.

• AgCl

• NaCl

• AgBr

• ZnS

when ZnO is heated it turns yellow. It shows

• non stoichiometric defect due to cation deficiency

• non stoichiometric defect due to cation excess

• non stoichiometric defect due to anion excess

F centre is

• The positions in the crystal lattice taken by the electrons in anion vacancy defect and is responsible for the colour of the substance.

• The positions in the crystal lattice taken by the anion in anion vacancy defect and is responsible for the co lour of the substance.

• The positions in the crystal lattice taken by the electron in cation vacancy defect and is responsible for the co lour of the substance.