How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00g?

[ Atomic masses Na=23, Cl = 35.5]

1. 2.57 x 1021

2. 5.14 x 1021

3. 1.28 x 1021

4. 1.71 x 1021

Subtopic:  Density & Packing Fraction |
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The ratio of cations to anion in a closed pack tetrahedral is:

1. 0.714

2. 0.225

3. 0.02

4. none of these

Subtopic:  Voids, Radius Ratio & Coordination Number |
 74%
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In a compound, atoms of element Y form ccp lattice, and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be :-
1. X3Y4
2. X4Y3 
3. X2Y3
4. X2Y

Subtopic:  Density & Packing Fraction |
 66%
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A spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in ccp layers. The normal spinel has 1/8th of the tetrahedral void occupied  by one type of metal and one half of the octahedral voids occupied by another type of metal ions. Such a spinel is formed by Zn2+, Al3+ and O2- with Zn2+ in tetrahedral void. Give the simplest formula of the spinel.

1. ZnAl2O4

2. ZnAl2O3

3. ZnAlO

4. None of these

Subtopic:  Magnetic Behaviour of an Element/Compound |
 66%
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Close packing is maximum in the crystal lattice of:

1. simple cubic

2. face centred

3. body centred

4. none of these

Subtopic:  Density & Packing Fraction |
 83%
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Frenkel defect is noticed in:

1. AgBr

2. ZnS

3. Agl

4. All of the above

Subtopic:  Imperfections in Solids & Semiconductors |
 82%
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The density of KCl is 1.9893 g cm-3 and the length of a side unit cell is 6.29082 Å as determined by X-ray diffraction. The value of Avogadro’s number calculated from this data is:-

1. 6.017 x 1023

2. 6.023 x 1022

3. 7.03 x 1023

4. 6.01 x 1019

Subtopic:  Density & Packing Fraction |
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How many octahedral and tetrahedral holes are present per unit cell in a face centred cubic arrangement of atoms?

1. 8,4

2. 1,2

3. 4,8

4. 2 ,1

Subtopic:  Introduction & Crystal System |
 76%
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TiO2 is a well-known example of:

1. Triclinic system.

2. Tetragonal system.

3. Monoclinic system.

4. None of the above.

Subtopic:  Introduction & Crystal System |
 59%
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For a solid with the following structure, the co-ordination number of the point B is:

1. 3

2. 4

3. 5

4. 6

Subtopic:  Voids, Radius Ratio & Coordination Number |
 51%
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