JEE Main 2024 — Chemistry Inorganic Chemistry

$\begin{aligned} & {\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow \mathrm{d}^2 \mathrm{sp}^3} \\ & { }_{23} \mathrm{~V}:-[\mathrm{Ar}] 3 \mathrm{~d}^3 4 \mathrm{~s}^2 \\ & \left.\mathrm{~V}^{+3}:-[\mathrm{Ar}] 3 \mathrm{~d}^2, \mathrm{n}=2 \text { (even number of unpaired } \mathrm{e}^{-}\right) \\ & {\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow \mathrm{sp}^3 \mathrm{~d}^2} \\ & { }_{24} \mathrm{Cr}:-[\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^1 \\ & \left.\mathrm{Cr}^{+2}:-[\mathrm{Ar}] 3 \mathrm{~d}^4, \mathrm{n}=4 \text { (even number of unpaired } \mathrm{e}^{-}\right)\end{aligned}$​[V(H2​O)6​]3+→d2sp323​ V:−[Ar]3 d34 s2 V+3:−[Ar]3 d2,n=2 (even number of unpaired e−)[Cr(H2​O)6​]2+→sp3 d224​Cr:−[Ar]3 d54 s1Cr+2:−[Ar]3 d4,n=4 (even number of unpaired e−)​

$$\begin{aligned} & {\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow \mathrm{sp}^3 \mathrm{~d}^2} \\ & \mathrm{Fe}^{3+}:-[\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^0 \\ & \mathrm{n}=5\left(\text { odd number of unpaired } \mathrm{e}^{-}\right) \\ & {\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow \mathrm{sp}^3 \mathrm{~d}^2} \\ & \mathrm{Ni}:-[\mathrm{Ar}] 3 \mathrm{~d}^8 4 \mathrm{~s}^2 \\ & \left.\mathrm{Ni}^{+3}:-[\mathrm{Ar}] 3 \mathrm{~d}^7, \mathrm{n}=3 \text { (odd number of unpaired } \mathrm{e}^{-}\right) \\ & {\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow \mathrm{sp}^3 \mathrm{~d}^2} \\ & \mathrm{Cu}:-[\mathrm{Ar}] 3 \mathrm{~d}^9 4 \mathrm{~s}^0 \\ & \left.\mathrm{n}=1 \text { (odd number of unpaired } \mathrm{e}^{-}\right)\end{aligned}$$​[Fe(H2​O)6​]3+→sp3 d2Fe3+:−[Ar]3 d54 s0n=5( odd number of unpaired e−)[Ni(H2​O)6​]3+→sp3 d2Ni:−[Ar]3 d84 s2Ni+3:−[Ar]3 d7,n=3 (odd number of unpaired e−)[Cu(H2​O)6​]2+→sp3 d2Cu:−[Ar]3 d94 s0n=1 (odd number of unpaired e−)​