Atomic Structure — Hard JEE chemistry MCQ
Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option.
[Atomic Number: $\mathrm{Fe}=26, \mathrm{Mn}=25$, $\mathrm{Co}=27$ ]
\textbf{List-I}
(P) $t_{2 g}^{6} e_{g}^{0}$
(Q) $t_{2 g}^{3} e_{g}^{2}$
(R) $\mathrm{e}^{2} \mathrm{t}_{2}^{3}$
(S) $t_{2 g}^{4} e_{g}^{2}$
\textbf{List-II}
(1) $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(2) $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(3) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$
(4) $\left[\mathrm{FeCl}_{4}\right]^{-}$
(5) $\left[\mathrm{CoCl}_{4}\right]^{2-}$
- A. $\mathrm{P} \rightarrow 1$; Q $\rightarrow 4$; $\mathrm{R} \rightarrow 2$; $\mathrm{S} \rightarrow 3$
- B. $\mathrm{P} \rightarrow 1 ; \mathrm{Q} \rightarrow 2 ; \mathrm{R} \rightarrow 4 ; \mathrm{S} \rightarrow 5$
- C. $\mathrm{P} \rightarrow 3 ; \mathrm{Q} \rightarrow 2 ; \mathrm{R} \rightarrow 5 ; \mathrm{S} \rightarrow 1$
- D. $\mathrm{P} \rightarrow 3 ; \mathrm{Q} \rightarrow 2 ; \mathrm{R} \rightarrow 4$; $\mathrm{S} \rightarrow 1$
Solution
The correct option is **D**.