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The radii of N a + and C l - ions are 95 pm and 181 pm respectively. The edge length of N a C l unit cell is

Options

  1. A276 pm
  2. B138 pm
  3. C552 pm
  4. D415 pm

Correct answer

C. 552 pm

Step-by-step solution

N a C l has fcc structure. In fcc lattice with ions in octahedral voids r + + r − = a 2 Where, a   = edge length r + = 95 pm, r − = 181 pm Edge length = 2r + + 2r − = ( 2 × 95 + 2 × 181 ) pm = 190 + 362 = 552 pm

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