Single Choice

Which of the following statement is not true?

ASilicon carbide is covalent crystal.
BMolecular crystals are soft in nature.
CIn calcium fluoride structure, coordination number of $$Ca^{2+}$$ is 4.
Correct Answer
DIncrease in radius ratio results in incresse in coordination number.

Solution

In $${ CaF }_{ 2 }$$, the coordination number is $$8:4$$ i.e. $${ Ca }^{ 2+ }$$ is surrounded by 8 $${ F }^{ - }$$ ions. So, coordination number of $${ Ca }^{ 2+ }$$ is 8. So, option C is not correct.

SIMILAR QUESTIONS

Solid State

Co-ordination number of cation is minimum in:

Solid State

Coordination number of $$Na^{+}$$ ion in $$NaCl$$ is 6 and that of caesium ion in $$CsCl$$ is 8.This is because:

Solid State

The intermetallic compound LiAg crystallizes in a cubic lattice in which lithium and silver atoms have co-ordination number of $$8$$. To what crystal class does the unit cell belong?

Solid State

The co-ordination number of sodium in sodium chloride is:

Solid State

The ionic radii of $$A^{+}$$ and $$B^{-}$$ ions are $$0.98\times 10^{-10}m$$ and $$1.81\times 10^{-10}m$$. The coordination number of each ion in $$AB$$ is:

Solid State

The coordination number of $$Al$$ in the crystalline state of $$AlCl_{3}$$ is:

Solid State

(i) What is meant by the term 'coordination number'? (ii) What is the coordination number of atoms: (a) in a cubic close-packed structure? (b) in a body-centred cubic structure?

Solid State

$$NaCl$$ type crystal (with coordination no. 6:6) can be converted into $$CsCl$$ type crystal (with coordination no. 8:8) by applying:

Solid State

Write the coordination number of NaCl crystals.

Solid State

Write the coordination number of CsCl crystals.

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