A) \[Z{{n}^{2+}},C{{u}^{2+}},T{{i}^{3+}},C{{o}^{2+}}\]
B) \[Z{{n}^{2+}},C{{r}^{+}},T{{i}^{4+}},{{V}^{2+}}\]
C) \[C{{r}^{3+}},M{{n}^{2+}},Z{{n}^{2+}},T{{i}^{4+}}\]
D) \[M{{n}^{7+}},C{{r}^{6+}},C{{u}^{+}},{{V}^{2+}}\]
Correct Answer: B
Solution :
| Ions of elements which have paired electrons or no electrons in d-orbitals are colourless. |
| The electronic configuration of the elements are as follows: |
| \[Z{{n}^{2+}}=[Ar]3{{d}^{10}}4{{s}^{0}}\]\[\Rightarrow \]Paired d-electrons. |
| \[C{{r}^{+}}=[Ar]3{{d}^{10}}4{{s}^{0}}\]\[\Rightarrow \]Paired d-electrons. |
| \[T{{i}^{4+}}=[Ar]\,3{{d}^{0}}\]\[\Rightarrow \]No d-electrons. |
| \[{{V}^{2+}}=[Ar]\,3{{d}^{0}}\]\[\Rightarrow \]No d-electrons. |
| Thus, the set of above ions are colourless. |
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