Question

Which of the following statement is not true?

• A. Silicon carbide is a covalent crystal.
• B. Molecular crystals are soft in nature.
• C. In calcium fluoride structure, coordination Number of $Ca^{2 +}$is 4.
• D. Increase in radius ratio results in increases in coordination number.

Answer 1

Answer: (C)

In calcium fluoride structure, coordination

Number of $Ca^{2 +}$is 4.

Answer 2

Coordination number of $Ca^{2 +}inCaF_{2}$is 8.