Which of the following compounds is not coloured ?

N a_{2} [C u C l_{4}]

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N a_{2} [C d C l_{2}]

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[C r (H_{2} O)_{6}] C l_{3}

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all of the above

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Solution

The correct option is C $N a_{2} [C d C l_{2}]$
The outer shell electronic configuration of $C u^{2 +}$ has $3 d^{9}$ configuration and contain 1 unpaired electron, thus it is coloured.
$N a_{2} [C d C l_{2}]$ , compound is not coloured because of central atom $C d$ which has $4 d^{10} 5 s^{2}$ electronic configuration so transition do not occur.
Hence option B

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[C o (N H_{3})_{6}] C l_{3}

[N i (N H_{3})_{6}] C l_{2}

[C r (H_{2} O)_{6}] C l_{3}

[F e (H_{2} O)_{6}] C l_{2}

\begin{matrix} N a_{2} S & + & X & ⟶ & N a_{2} [F e (C N)_{5} (N O S)] p u r p l e c o l o r \end{matrix}

[C r (H_{2} O)_{6}] C l_{3}

[C r (H_{2} O)_{5}] C l_{2} . H_{2} O

N a_{2} S + N a_{2} [F e (C N)_{5} N O] ⟶ N a_{4} [F e (C N)_{5} N O S]

[C r (H_{2} O)_{6}] C l_{3}

(A)

[C r (N H_{3})_{6}] C l_{3}

(B)

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