A compound is formed by two elements X and Y. The element Y forms cubic close packed arrangement and those of element X occupy one third of the tetrahedral voids. What is the formula of the compound ?

Question

(A) X2Y3
(B) X3Y2
(C) X3Y
(D) XY3

Prashant Kotian · Accepted Answer

Effective number of Y atom = 4 (Y forms cubic close packed arrangement) Effective number of X atom = 3 1  = 8 (X occupy one third of the tetrahedral voids) so formula of compound = 3 Y X 3          = X2Y3

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