TiO₂ is a well-known example of:

1. Triclinic system.

2. Tetragonal system.

3. Monoclinic system.

4. None of the above.

Which arrangement of electrons leads to anti-ferromagnetism?

1.  

2.  

3. Both (1) and (2)

4. None of the above.

Graphite in an example of-

1. Ionic solid

2. Covalent solid

3. Molecular Solids

4. Metallic crystal

The mass of a unit cell of CsCl corresponds to:-
1. 8Cs⁺ and Cl^-
2. 1Cs⁺ and 6Cl^-
3. 1Cs⁺ and 1Cl^-
4. 4Cs⁺ and Cl^-

What type of crystal defects is indicated in the diagram given below?

1. Frenkel and Schottky defects

2. Schottky defect

3. Interstitial defect

4. Frenkel defect

The phenomenon in which polar crystals on heating produce electricity is called:-

1. Pyro-electricity.
2. Piezo-electricity.
3. Ferro-electricity.
4. Ferri-electricity.

Ice crystallizes in a hexagonal lattice having the volume of the unit cell as $132\times {10}^{-24}$ $c{m}^3$. If the density is 0.92 g/cm³ at a given temperature, then the number of H₂O molecules per unit cell is : 

1. 1

2. 2

3. 3

4. 4

Packing fraction of simple cubic crystal lattice is 

1. 38%

2. 74%

3. 68%

4. 52.4%

In a metal oxide, the oxide ions are arranged in hexagonal close packing and metal ions occupy two third of the octahedral voids. The formula of the oxide is : 

1. MO

2. M₂O₃

3. MO₂

4. M₂O

Analysis show that nickel oxide consist of nickel ion with 96% ions having d⁸ configuration and 4% having d⁷ configuration. Which amongst the following best represents the formula of the oxide.

(1) Ni_1.02O_1.00

(2) Ni_0.96O_1.00

(3) Ni_0.96O_0.98

(4) Ni_0.98O_1.00