Question

$TiCl$ has the structure similar to $CsCl,$ the coordination number of $T{i}^{+}$ is -

• A. 4
• B. 6
• C. 10
• D. 8

Answer 1

The correct option is D 8

$TiCl$ has the structure similar to $CsCl$.
Hence,
$TiCl$ crystallizes in a body centred cubic structure where $C{l}^{-}$ ions forms a simple cubic structure with $T{s}^{+}$ ion occupying the body centre.
This type of structure is formed when the anion and cation have similar sizes.

$T{i}^{+}$ ion at the centre is surrounded by 8 $C{l}^{-}$ ions in the corners of the cube. Thus, the coordination number of $T{s}^{+}$ ion is 8.
Each $C{l}^{-}$ ion at the corner is shared by 8 $T{s}^{+}$ from eight unit cells. Thus, the coordination number of $C{l}^{-}$ is 8
The coordination number of $TiCl$ is
8 : 8
$CsBr,CsI,CsCN,TiCl,TiBr,TiCN,etc$ have the structures similar to $CsCl$