Q4 of 26 Page 1

What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy2/3rd of octahedral voids?

Formula of the compound would be X2Y3.

Explanation: A ccp lattice is formed by the element Y of the compound. Hence, number of octahedral voids = number of atoms of element Y. In that element X occupies 2/3rd of the voids. So, formula of the compound is given by X:Y = 2/3:1 = 2:3.


∴ formula of the compound is X2Y3.


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