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NDA 1 2024 GAT, question 102

Topic: Chemistry

Q102

What is the coordination number of Na+Na^{+} and Cl−Cl^{-} ions in NaClNaCl lattice ?

  1. (a) 6,16,1
  2. (b) 1,61,6
  3. (c) 6,66,6Correct answer
  4. (d) 5,55,5

Solution.

Answer: (c) 6,66,6

  1. In the rock-salt lattice each Na⁺ is surrounded octahedrally by six Cl⁻ ions, and each Cl⁻ by six Na⁺ ions.
  2. Both coordination numbers are 6.