If NaCl is doped with 10^-4 mol % of SrCl₂, the concentration of cation vacancies will be

(N_A = 6.023 x 10²³ mol^-1)                                                                             

1. 6.023 x 10¹⁵ mol^-1             

2. 6.023 x 10¹⁶ mol^-1

3. 6.023 x 10¹⁷ mol^-1             

4. 6.023 x 10¹⁴ mol^-1                                     

The edge length of cube is 400pm. Its body diagonal would be-

1. 500 pm

2. 693 pm

3. 600 pm

4. 566 pm

Total volume of atoms present in a face centred cubic unit cell of a metal is -

(r is atomic radius)

1. 20/3 $\pi$r³

2. 24/3 $\pi$r³

3. 12/3 $\pi$r³

4. 16/3 $\pi$r³

A solid has a bcc structure. If the distance of closest approach between the two atoms is 1.73 Å, then the edge length of the cell is:

1. 200 pm

2. \(\frac{\sqrt{3}}{\sqrt{2}}\) pm

3. 142.2 pm

4. \(\sqrt{2 }\)pm

Which is covalent solid?

1. Silicate

2. Diamond

3. Graphite 

4. All of these

The anions (A) form hexagonal closest packing and atoms (C) occupy only 2/3 of octahedral voids in it. The general formula of the compound is-
1. CA
2. CA₂
3. C₂A₃
4. C₃A₂

Graphite in an example of-

1. Ionic solid

2. Covalent solid

3. Molecular Solids

4. Metallic crystal

Select the correct statement (s)-

(a) The C.N. of cation occupying a tetrahedral hole is 4.

(b) The C.N. of cation occupying a octahedral hole is 6.

(c) In schottky defects, density of the lattice decreases,

1. a,b

2. b,c

3. a,b,c

4. a,c

Which arrangement of electrons leads to anti-ferromagnetism?

1.  

2.  

3. Both (1) and (2)

4. None of the above.

Among the following types of voids. which one is the largest void:-

1. Triangular system

2. Tetragonal system

3. Monoclinic system

4. Octahedral