A) \[Zn>Fe>Cu>Cr\]
B) \[Sc=Ti<V=Cr\]
C) \[Zn<Cu<Ni<Co\]
D) \[V>Cr>Mn>Fe\]
Correct Answer: A
Solution :
The ionisation energies increase with increase in atomic number. However, the trend is some irregular among d-block elements. On the basis of electronic configuration, the \[Zn:1{{s}^{2}}2{{s}^{2}}{{p}^{6}}3{{s}^{2}}{{p}^{6}}{{d}^{10}}4{{s}^{2}}\] \[\operatorname{Fe}:\,\,1{{s}^{2}}2{{s}^{2}}\,{{p}^{6}}3{{s}^{2}}\,{{p}^{6}}\,{{d}^{6}}\,4{{s}^{2}}\] \[Cu:\,\,1{{s}^{2}}2{{s}^{2}}\,{{p}^{6}}3{{s}^{2}}\,{{p}^{6}}\,{{d}^{10}}\,4{{s}^{1}}\] \[\operatorname{Cr}:\,\,1{{s}^{2}}\,2{{s}^{2}}{{p}^{6}}\,3{{s}^{2}}\,{{p}^{6}}{{d}^{5}}4{{s}^{1}}\] \[{{\operatorname{IE}}_{1}}\,\,follows\,the\,order:Zn>Fe>Cu>Cr\]
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