What is the effect of Schottky and Frenkel defects on the density of crystalline solids?
Schottky defect decrease the density solid where as no such defect arise due to frenkel defect.
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Multiple Choice Questions
If the distance between Na+ and CI– ions in NaCl crystal is a pm, what is the length of the cell edge?
2a pm
a / 2 pm
4a pm
a/4 pm
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Most crystals show good cleavage because their atoms, ions and molecules are
Weakly bonded together
strongly bonded together
spherically symmetrical
arranged in planes.
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The tetrahedral voids formed by ccp arrangement of CI– ions in rock salt structure are:
Occupied by Na+ ions
Occupied by CI– ions
Occupied by either Na+ or CI– ions
Vacant
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The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangements is:
74%
70%
60.4%
52.4%
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CsCl has which type of lattice?
SC
fcc
bcc
hcp
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Short Answer Type
What makes the crystal of KCl appear sometimes violet?
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Name the crystal defect which lowers the density of an ionic crystal
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Multiple Choice Questions
A compound is formed by elements A and B. This crystallises in the cubic structure when atoms A are at the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is:
