A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. The formula of the compound is-

1. X2Y3
2. XY3
3. XY
4. X2Y

Subtopic:  Voids, Radius Ratio & Coordination Number |
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Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. The formula of the compound formed by the elements A and B is :
1. A
2B3
2. A4B3
3. A4B
4. AB3

Subtopic:  Voids, Radius Ratio & Coordination Number |
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An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. The number of atoms present in 208 g of the element are
1. 14.16×10
21 atoms
2. 24.16×10
21 atoms
3. 14.16×10
23 atoms
4. 24.16×10
23 atoms

Subtopic:  Density & Packing Fraction |
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X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm. It can be concluded from the given data that the atomic mass of copper is :
1. 61.1 u
2.  63.1 u
3. 122.2 u
4. 126.1 u

Subtopic:  Density & Packing Fraction |
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Silver forms ccp lattice and X-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm. The density of silver (Atomic mass = 107.9 u) is-

1. 10.5 g cm-3
2.
9.5 g cm-3
3. 11.5 g cm-3
4. 12.5 g cm-3

 

Subtopic:  Density & Packing Fraction |
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