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How many units of NaCl is present per unit cell of NaCl?

Options

  1. A4
  2. B6
  3. C2
  4. D8

Correct answer

A. 4

Step-by-step solution

C l - ions form ccp lattice i.e 8 at corners + 6 at face centres. ⇒ 8 × 8 18 + 6 × 1 2 = 4 C l - i o n s N a + at octahedral voids 12 at centre edges plus one at body centre. ⇒ 12 × 1 4 + 1 = 4 N a + i o n s i.e 4NaCl molecules per unit cell.

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