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Atoms of element X form a BCC and atoms of element Y occupy 3/4^th of the tetrahedral voids. What is the formula of the compound?(a) X2Y3(b) X3Y2(c) X3Y4(d) X4Y3I got this question during an online interview.This question is from Solid State topic in division Solid State of Chemistry – Class 12

Answer»

Right answer is (a) X2Y3

The best explanation: The NUMBER of tetrahedral voids form is EQUAL to twice the number of atoms of ELEMENT X. Number of atoms of Y is 3/4^th the number of tetrahedral voids i.e. 3/2 times the number of atoms of X. THEREFORE, the ratio of NUMBERS of atoms of X and Y are 2:3, hence X2Y3.



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