A) The endothermic character of the 2nd IP c not so high
B) size of \[C{{u}^{2+}}\]is less than \[C{{u}^{+}}\]
C) \[C{{u}^{2+}}\] has stabler electronic configuration as compared to \[C{{u}^{+}}\]
D) the lattice energy released for cupric compounds is much higher than \[C{{u}^{+}}\]
Correct Answer: A
Solution :
Electronic configurations of cuprous \[(C{{u}^{+}})\] and cupric \[(C{{u}^{2+}})\] ions are as follows \[C{{u}^{+}}=[Ar]3{{d}^{10}}4{{s}^{0}}\] \[C{{u}^{+}}=[Ar]3{{d}^{9}}4{{s}^{0}}\] Thus, electronic configuration of \[C{{u}^{+}}\]is more stable but it is less stable because in \[C{{u}^{2+}}\]due to its small size the nuclear charge is sufficient to hold 27 electrons but in \[C{{u}^{+}}\]such a condition is not true. Further, the IInd IP of Cu is not very high as compared to its 1st IP. Consequently a large amount of lattice energy is released for cupric compounds as compared to \[C{{u}^{+}}\]compounds.
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