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

(NA = 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                                     

Subtopic:  Density & Packing Fraction |
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The edge length of cube is 400pm. Its body diagonal would be-

1. 500 pm

2. 693 pm

3. 600 pm

4. 566 pm

Subtopic:  Introduction & Crystal System |
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Total volume of atoms present in a face centred cubic unit cell of a metal is -

(r is atomic radius)

1. 20/3 πr3

2. 24/3 πr3

3. 12/3 πr3

4. 16/3 πr3

Subtopic:  Voids, Radius Ratio & Coordination Number |
 69%
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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. 32 pm

3. 142.2 pm

4. pm

Subtopic:  Density & Packing Fraction |
 65%
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Which is covalent solid?

1. Silicate

2. Diamond

3. Graphite 

4. All of these

Subtopic:  Introduction & Crystal System |
 83%
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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

Subtopic:  Density & Packing Fraction |
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Graphite in an example of-

1. Ionic solid

2. Covalent solid

3. Molecular Solids

4. Metallic crystal

Subtopic:  Introduction & Crystal System |
 92%
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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

Subtopic:  Voids, Radius Ratio & Coordination Number |
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Which arrangement of electrons leads to anti-ferromagnetism?

1.  

2.  

3. Both (1) and (2)

4. None of the above.

Subtopic:  Magnetic Behaviour of an Element/Compound |
 81%
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Among the following types of voids. which one is the largest void:-

1. Triangular system

2. Tetragonal system

3. Monoclinic system

4. Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
 69%
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