Multiple choice

Which of the following statements are incorrect regarding rock-salt structure? P. Cations occupy the lattice points of expanded face centred cubic lattice and the anions occupy all the octahedral holes. Q. The limiting radius ratio is in between 0.414 and 0.732. R. The coordination numbers of cation and anion are 4 and 8 respectively. S. The general formula of ionic compounds having rock-salt structure is AB. Select the correct answer using codes given below:

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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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