An element has a body-centered cubic (BCC) structure with a cell edge of 288 pm. The atomic radius is:

1. $\frac{\sqrt{2}}{4}\times 288$ pm

2. $\frac{4}{\sqrt{3}}\times 288$ pm

3. $\frac{4}{\sqrt{2}}\times 288$ pm

4. $\frac{\sqrt{3}}{4}\times 288$ pm

The crystal with a metal deficiency defect is - 

1. NaCl 

2. FeO

3. ZnO 

4. KCl

The electrical conductivity of semiconductors increases with a rise in temperature because:

Select the correct option based on statements below:

The packing efficiency of the face-centered cubic unit cell is:
(assuming that the atoms are touching each other)

1. 52.40 %

2. 68.04 %

3. 74 %

4. 79.06 %

Copper crystallizes into an fcc lattice with an edge length of 3.61 × 10⁻⁸ cm. The density of copper crystal will be - 

1. 7.46 g cm^-3

2. 9.67 g cm^-3

3. 8.96 g cm^-3

4. 5.63 g cm^-3

A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. The formula of the compound would be -

1. MN

2. M₃N₄

3. M₂N₃

4. M₃N₂

Select the correct option based on statements below:

The incorrect statement among the following regarding crystalline solid is -

An example of amorphous solid among the following is -

1. Graphite (C)

2. Quartz glass (SiO₂)

3. Chrome alum

4. Silicon carbide (SiC)