The tetrahedral voids formed by ccp arrangement of Cl− ions in rock salt structure are:
A
occupied by Na+ ions
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B
occupied by Cl− ions
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C
occupied by either Na+ or Cl− ions
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D
vacant
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Solution
The correct option is C vacant The tetrahedral voids formed by ccp arrangement of Cl− ions in rock salt structure are vacant. In the rock salt structure, Cl− ions form face centred cube and Na+ ions are present in octahedral voids. Each unit cell contains 4 formula units of NaCl.