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A compound is formed by X and Y. Atoms of Y makes FCC and those of X occupy all the octahedral voids. The formula of the compound is

Question and options

A compound is formed by X and Y. Atoms of Y makes FCC and those of X occupy all the octahedral voids. The formula of the compound is
  1. X2Y3\mathrm{X_2Y_3}
  2. X3Y2\mathrm{X_3Y_2}
  3. XY\mathrm{XY}
  4. X4Y\mathrm{X_4Y}

Answer and explanation

Correct answer: C - \(\mathrm{XY}\)
An FCC lattice of Y has 4 atoms per unit cell and 4 octahedral voids; X filling all of them gives X4Y4=XY\mathrm{X_4Y_4 = XY} (rock-salt type).

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