The aqueous solution containing which one of the following ions will be colourless? (Atomic number : $\mathrm{Sc}=21, \mathrm{Fe}=26, \mathrm{Ti}=$ $22, \mathrm{Mn}=25$)

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Aicharya · Accepted Answer

\(\begin{array}{|c|c|c|}
\hline \text { Ion } & \begin{array}{c}
\text { No. of } \\
\text { Electrons }
\end{array} & \begin{array}{c}
\text { Electronic } \\
\text { Configuration }
\end{array} & \text{ Electronic Configuration in box } & \begin{array}{c}
\text { No. of } \\
\text { Unpaired }
\end{array} & \begin{array}{c}
\text { Magnetic } \\
\text { Nature }
\end{array} & \begin{array}{c}
\text { Magnetic Mo- } \\
\text { ment (BM) } \\
\mu=\sqrt{n(\boldsymbol{n}+2)}
\end{array} \\
\hline \mathrm{Sc}^{3+} & 18 & {[\mathrm{Ar}] 3 d^0 4 \mathrm{~s}^0} & [\mathrm{Ar}] ~ \begin{array}{|l|l|l|l|l|}
\hline ~~ & ~~ & ~~ & ~~ & ~~ \\
\hline
\end{array} ~~ \begin{array}{|l|}
\hline ~~ \\
\hline
\end{array} & 0 & \text { Diamagnetic } & 0 \\ \\
\hline \mathrm{Ti}^{3+} & 22 & {[\mathrm{Ar}] 3 d^4 4 \mathrm{~s}^0} & [\mathrm{Ar}] ~ \begin{array}{|l|l|l|l|l|}
\hline \uparrow & ~~ & ~~ & ~~ & ~~ \\
\hline
\end{array} ~~ \begin{array}{|l|}
\hline ~~ \\
\hline
\end{array} & 1 & \text { Paramagnetic } & 1.73 \\ \\
\hline \mathrm{Mn}^{2+} & 23 & {[\mathrm{Ar}] 3 d^5 4 \mathrm{~s}^0} & [\mathrm{Ar}] ~ \begin{array}{|l|l|l|l|l|}
\hline \uparrow & \uparrow & \uparrow & \uparrow & \uparrow \\
\hline
\end{array} ~~ \begin{array}{|l|}
\hline ~~ \\
\hline
\end{array} & 5 & \text { Paramagnetic } & 5.92 \\ \\
\hline \mathrm{Fe}^{2+} & 24 & {[\mathrm{Ar}] 3 d^6 4 \mathrm{~s}^0} & [\mathrm{Ar}] ~ \begin{array}{|l|l|l|l|l|}
\hline \uparrow \downarrow & \uparrow & \uparrow & \uparrow & \uparrow \\
\hline
\end{array} ~~ \begin{array}{|l|}
\hline ~~ \\
\hline
\end{array} & 4 & \text { Paramagnetic } & 4.9 \\ \\
\hline
\end{array}\)
Related Theory Because of the relatively high forces of attraction among the water molecules due to intermolecular hydrogen bonding, water has $a$ higher surface tension than most other liquids. Related Theory Magnetic properties arise from the spin and orbital angular momentum of the electrons contained in a compound. Compounds are diamagnetic when they contain no unpaired electrons.

The aqueous solution containing which one of the following ions will be colourless? (Atomic number :…

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