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A solid is made of two elements X and Z. The atoms Z are in CCP arrangement while the atom X occupies all the tetrahedral sites. What is the formula of the compound

a. XZ

b. XZ2

c. X 2  Z

d.  X 2  Z 3

Ans. c

Explanation : Tetrahedral sites are double comparable to octahdral sites then ration of X and Z respectively  2 : 1 since formula of the compound  X 2   Z

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