A solid PQ has rock salt type structure in which Q atoms are the corners of the unit cell. If the body-centred atoms in all the unit cells are missing, the resulting stoichiometry will be

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Prashant Kotian · Accepted Answer

Correct answer: C. In rock-salt structures, anions (Q) form an FCC lattice (4 atoms/cell) and cations (P) occupy octahedral sites (1 body-center + 12 edge-centers = 4 atoms). Removing the single body-centered P atom leaves 3 P atoms, resulting in P3Q4.

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