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  4. Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?

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Q. Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?

The d-and f-Block Elements

Solution:

$Ag_2SO_4 \to Ag^+(4d^{10}) -$ colourless
$CuF_2 \to Cu^{2+}(3d^9) -$ coloured
$ZnF_2 \to Zn^{2+}(3d^{10}) -$ colourless
$Cu_2Cl+2 \to Cu^+(3d^{10}) -$ colourless