Which of the following compounds is not colou | vedclass

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Question

The outer shell electronic configuration of $Cu ^{2+}$ has $3 d ^9$ configuration and contain $1$ unpaired electron, thus it is coloured.

$Na _2\le

Vedclass · Accepted Answer

$Na_2[CdCl_2]$

Vedclass · Answer

The outer shell electronic configuration of $Cu ^{2+}$ has $3 d ^9$ configuration and contain $1$ unpaired electron, thus it is coloured.

$Na _2\left[ CdCl _2\right]$, compound is not coloured because of central atom $Cd$ which has $4 d ^{10} 5 s ^2$ electronic configuration so transition do not occur.

Example	Magnetic Moment $(BM)$
$K _{4}\left[ Mn ( CN )_{6}\right.$	$2.2$
$\left[ Fe \left( H _{2} O \right)_{6}\right]^{2+}$	$5.3$
$K _{2}\left[ MnCl _{4}\right]$	$5.9$

Which of the following compounds is not coloured ?

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$\left[ Fe \left( H _{2} O \right)_{6}\right]^{2+}$ $5.3$

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