Multiple choice

Which of the following statements is/are not correct about halite structure?

  1. Cations occupy the lattice points of expanded fcc lattice and the anions occupy all the octahedral holes.
  2. The limiting radius ratio is in between 0.414 and 0.732.
  3. The coordination numbers of cation and anion are 4 and 8 respectively.
  4. The general formula of ionic compounds having halite structure is AB.

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In halite or rock-salt structure, anions occupy the lattice points of expanded face centred cubic lattice and the cations occupy all the octahedral holes. The limiting radius ratio is in between 0.414 and 0.732. The co-ordination numbers for both cation and anion is 6:6. The general formula of ionic compounds having this structure is AB. Examples: NaCl, KCl, MgO, CaO etc.

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