A) \[C{{u}^{+}},Z{{n}^{2+}},C{{a}^{2+}}\]
B) \[S{{c}^{3+}},T{{i}^{4+}},{{V}^{5+}}\]
C) \[C{{u}^{2+}},C{{r}^{+}},M{{n}^{2+}}\]
D) \[N{{i}^{2+}},C{{u}^{+}},H{{g}^{2+}}\]
Correct Answer: C
Solution :
Ion is coloured if there are electrons in d-suborbit. Paramagnetic nature is also due to unpaired electrons. Thus, every coloured ion is also paramagnetic. \[C{{u}^{2+}}=[Ar]3{{d}^{9}},\]one unpaired electron in 3d. \[C{{r}^{+}}=[Ar]3{{d}^{5}};\] five unpaired electrons in 3d. \[M{{n}^{2+}}=[Ar]3{{d}^{5}}\]five unpaired electrons in 3d.
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