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A compound of formula A

_{2}B_{3}has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :2

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Which premitive unit cell has unequal edge lengths (a $$ \ne $$ b $$ \ne $$ c) and all axial angles different from 90

^{o}?3

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At 100

[Atomic Mass of Cu = 63.55 u]

^{o}C, copper (Cu) has FCC unit cell structure with cell edge length of x $$\mathop A\limits^o $$. What is the approximate density of Cu (in g cm^{$$-$$3}) at this temperature?[Atomic Mass of Cu = 63.55 u]

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Which type of ‘defect’ has the presence of cations in the interstitial sites?

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