A solid is formed and it has three types...

A solid is formed and it has three types of atoms X, Y and Z, X forms a fcc lattice with Y atoms occupying all tetrahedral voids and Z atoms occupying half of octahedral voids. The formula of solid is :-

`P_4QR_2`

`P_4Q_2R`

`PQ_2R_4`

`P_2Q_4R`

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