A) paired electrons
B) lone pair of electrons
C) unpaired electrons
D) none of the above
Correct Answer: C
Solution :
Formation of coloured solution is possible when metal ion in the compound contains unpaired electrons, eg, \[C{{u}^{+}}\,\,\,\,:\,\,\,\,3{{d}^{10}}\,\,4{{s}^{0}}\] colourless \[C{{u}^{2+}}\,\,\,\,:\,\,\,\,3{{d}^{9}}\,\,4{{s}^{0}}\] blue
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