Which one of the following ions is colourless?
- A$Cu^{+}$
- B$Co^{2+}$
- C$Ni^{2+}$
- D$Fe^{3+}$
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Zinc does not show variable valency like $d-$block elements because
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View Solution$3d^{10}4s^0$ electronic configuration is exhibited by
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View SolutionMatch the species in List-$I$ with their correct electronic configuration in List-$II$.
List-$I$ List-$II$ $(1) \ \text{Cr}$ $(A) \ [\text{Ar}] \ 3d^8 4s^0$ $(2) \ \text{Fe}^{2+}$ $(B) \ [\text{Ar}] \ 3d^{10} 4s^1$ $(3) \ \text{Ni}^{2+}$ $(C) \ [\text{Ar}] \ 3d^6 4s^0$ $(4) \ \text{Cu}$ $(D) \ [\text{Ar}] \ 3d^5 4s^1$ $(E) \ [\text{Ar}] \ 3d^6 4s^2$
| List-$I$ | List-$II$ |
| $(1) \ \text{Cr}$ | $(A) \ [\text{Ar}] \ 3d^8 4s^0$ |
| $(2) \ \text{Fe}^{2+}$ | $(B) \ [\text{Ar}] \ 3d^{10} 4s^1$ |
| $(3) \ \text{Ni}^{2+}$ | $(C) \ [\text{Ar}] \ 3d^6 4s^0$ |
| $(4) \ \text{Cu}$ | $(D) \ [\text{Ar}] \ 3d^5 4s^1$ |
| $(E) \ [\text{Ar}] \ 3d^6 4s^2$ |
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