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Question
A solid is made of two elements X and Z. The atoms Z are in CCP arrangement while the atom X occupy two-third of the tetrahedral sites. What is the formula of the compound?
Options:
A .  XZ
B .  XZ2
C .  X4Z3 
D .  X2Z3
Answer: Option C
:
C
Tetrahedral sites are double compared to octahedral sites; and X is present in two-third of them
a) So, ratio of X and Z equals 2×(23):1=4:3
formula of the compound = X4Z3

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