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JEE Main20205 Sep 2020Evening ShiftChemistrySolid StateActual

An element crystallises in a face–centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is:

Options

  1. Aa 2
  2. Ba
  3. C2 a
  4. Da 2

Correct answer

A. a 2

Step-by-step solution

In FCC octahedral voids are present at the edge centers and body center. Minimum distance between centers of two octahedral voids = x = a 2 2 + a 2 2 = a 2 4 + a 2 4 = a 2

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