Oxygen atoms forms fcc unit cell with 'A' atoms occupying all tetrahedral voids and 'B' atoms occupying all octahedral voids. If atoms are removed from two of the body diagonals then determine the formula of resultant compound formed.

1. A4B4O7

2. A8B6O7

3. A8B8O7

4. A6B8O6

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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A solid has a structure in which W atoms are located at the corners of a cubic lattice. Oxygen atom at the centre of the edges and Na atom at centre of the cube. The formula of the compound is 

1. NaWO2

2. NaWO3

3. Na2WO3

4. NaWO4

Concept Questions :-

Introduction and Type of Crystal System
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An element (atomic mass = 100 g mole)having BCC structure has unit cell edge 400 pm. The density of the element is (number of atom bcc(z)=2)

1. 2.144g/cm3
2. 5.2g/cm3
3. 7.289g/cm3
4. 10.376g/cm3

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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The radius of Ag+ ion is 126 pm and that I- ion is 216 pm. The coordination number of Ag+
ion is

1. 2

2. 4

3. 6

4. 8

Concept Questions :-

Voids and radius ratio/coordination number
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Schottky defect occurs mainly in electrovalent compound where 

1. Positive ions have large sizes

2. Negative ions have small sizes

3. Positive and negative ions are of similar size

4. Positive ions are big and negative ions are small

Concept Questions :-

Imperfections in Solids
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Analysis shows that an oxide ore of  nickel has formula  Ni0.98O1.00. The percentage of nickel as Ni3+ ions is nearly

1. 2

2. 96

3. 4

4. 98

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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The appearance of colour in solid alkali metal halides is generally due to :-

1. Frankel Defect
2. Interstitial Defect
3. F-Centres
4. Schottky Defect

Concept Questions :-

Imperfections in Solids
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A metal crystallises in two cubic crystal: FCC and BCC, whose unit cell edge lengths are 4Å and 2Å respectively. The ratio of their densities is:-

1. 1

2. 4

3. 0.25

4. 0.5

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Ice crystallises in a hexagonal lattice having volume of the unit cell as 132 x 10-24 cm3.   

If density is 0.92 g/cm3 at a given temperature, then number of  H20 molecules per unit cell is

1. 1

2. 2

3. 3

4. 4

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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AB crystallizers in a body-centred cubic lattice with edge length a equal to 387 pm. The distance between two oppositely charged ions in the lattice is

1. 250 pm

2. 200 pm

3. 300 pm

4. 335 pm

Concept Questions :-

Introduction and Type of Crystal System
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