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(B) The colour of transition metal ions in aqueous solution is primarily due to $d-d$ transitions. Ions with the same number of $d$-electrons often ex

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$Ti^{+3}$ and $V^{+2}$

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(B) The colour of transition metal ions in aqueous solution is primarily due to $d-d$ transitions. Ions with the same number of $d$-electrons often exhibit similar colours.$1$. $Cr^{+3}$ $(3d^3)$ is violet/green.$2$. $Fe^{+2}$ $(3d^6)$ is pale green.$3$. $Ti^{+3}$ $(3d^1)$ is purple.$4$. $V^{+2}$ $(3d^3)$ is violet.$5$. $Fe^{+3}$ $(3d^5)$ is yellow/brown.$6$. $Mn^{+2}$ $(3d^5)$ is pink.$7$. $Cu^{+}$ $(3d^{10})$ is colourless.$8$. $Ni^{+2}$ $(3d^8)$ is green.Comparing the options,$Cr^{+3}$ $(3d^3)$ and $V^{+2}$ $(3d^3)$ both have the same electronic configuration $(d^3)$ and exhibit similar violet/green colours. However,looking at standard chemistry data,$Cr^{+3}$ and $V^{+2}$ are both known to exhibit violet/green shades due to the $d^3$ configuration.

Which of the following pairs of ions may exhibit the same colour?

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