Which is the incorrect statement?

(1) _{${\mathrm{Fe}}_{0.95}\mathrm{O}$} has non-stoichiometric metal deficiency defect

(2) Density decreases in case of crystals with Schottky's defect

(3) NaCI(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal

(4) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca²⁺) and fluoride ion (F^-) are

(1) 4 and 2                   

(2) 6 and 6

(3) 8 and 4                   

(4) 4 and 8

Lithium has a bcc structure. Its density is 530 kg m^-3 and its atomic mass is 6.94 gmol^-1.

The edge length of a unit cell of lithium metal is -

(N_A=6.02 x10²³ mol^-1)

1. 352 pm

2. 527 pm

3. 264 pm

4. 154 pm

The ionic radii of A⁺ and B^- ions are 0.98 x 10^-10 m and 1.81 x10^-10 m.  The coordination

number of each ion in AB is.

1. 4

2. 8

3. 2

4. 6

A given metal crystallises out with a cubic structure having edge length of 361 pm. If

there are four metal atoms in one unit cell, what is the radius of one atom ?

1. 40 pm

2. 127 pm

3. 80 pm

4. 108 pm

The correct statement regarding defects in the crystalline solid is

1. Schottky defects have no effect on the density of crystalline solids

2. Frenkel defects decreases the density of crystalline solids

3. Frenkel defcct is a dislocation defect

4. Frenkel defect is found in halides of alkaline metals

The vacant space in bcc lattice cell is ;

1. 26%

2. 48%

3. 23%

4. 32%

if a is the length of the side of a cube, the distance between the body centered atom and

one corner atom in the cube will be :-

1. $\frac{2}{\sqrt{3}}a$

2. $\frac{4}{\sqrt{3}}a$

3. $\frac{\sqrt{3}}{4}a$

4. $\frac{\sqrt{3}}{2}a$

A metal cryszallizes with a face-centered cubic lattice. The edge of the unit cell is 408

pm. The diameter of the metal atom is

1. 288 pm

2. 408 pm

3. 144 pm

4. 204 pm

The number of octahedral void(s) per atom present in a cubic close-packed structure is

1. 1

2. 3

3. 2

4. 4