Select the incorrect statement for a CsCl crystal-A- Coordination number for Cs -and Cl -is 6B- r Cs - r Cl - 0-732C- The structure changes to NaCl type at 760 KD- Cl -ions are present at cubic sites

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Ionic Compounds and Radius Ratios

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Question

Select the incorrect statement for a $C s C l$ crystal:

Coordination number for

C s^{+}

and

C l^{-}

is 6

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\frac{r_{C s^{+}}}{r_{C l^{-}}} \geq 0.732

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The structure changes to

N a C l

type at

760 K

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C l^{-}

ions are present at cubic sites

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Solution

The correct option is A Coordination number for $C s^{+}$ and $C l^{-}$ is 6
$C s C l$ has a body-centred cubic (bcc) arrangement and the ratio of radius of cation and anion is more than 0.732 and less than 0.999.
Each $C s^{+}$ ion is surrounded by 8 $C l^{-}$ ions and each $C l^{-}$ ion is surrounded by 8 $C s^{+}$ ions therefore this structure has 8:8 co-ordination.
$C s C l$ structure on heating to about 760 K, changes to $N a C l$ structure.

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Similar questions

Q. The coordination number of

C s^{+}

and

C l^{-}

ions in

C s C l

structure is_________.

Q. In CsCl type structure, the coordination number of

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and

C l^{-}

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Q. Assertion :In the body-centered cubic type structure of CsCl, the

C s^{+}

ions are present in central octahedral void. Reason: In CsCl, the

C s^{+}

ion is at body-centered position and

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Read the above assertion and reason and choose the correct option regarding it.

Q. If the length of body diagonal for

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, which crystallises into a cubic structure with

{Cl}^{-}

ions at the corners and

{Cs}^{+}

ions at the centre of unit cell is

7 ˚ A

and the radius of

{Cs}^{+}

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1.69 ˚ A

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Q. If the length of the body diagonal for CsCl which crystallises into a cubic structure with

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Select the incorrect statement for a CsCl crystal:

Select the incorrect statement for a $C s C l$ crystal: