Question

A compound is formed by elements X,Y,Z .Atoms of Z make fcc lattice,atoms of X occupy all the octahedral voids, atoms of Y occupy 1/3rd of tetrahedral voids.The formula of the compound is

Answer 1

Z makes fcc lattice so the value of 'z' for Z is 4

no.of octahedral voids present is z = 4

X occupies all Octahedral voids.... value of z for X is 4

no. of tetrahedral voids present is 2z = 2× 4 =8

Y occupies ⅓ of tetrahedral voids... so value of z for Y is 8/3

so formula of compound is X4 Y8/3 Z4

OR simplify it X12 Y8 Z12

That is X3 Y2 Z3

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