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Orbital angular momentum for first series of transition metals is of no significance.

The observed paramagnetism in 4f-block elements is due to both orbital motion of the electron and its spinning
around its exists

Highest paramagnetism in 3d series in $+ 1$ oxidation state is shown by ${Mn}^{+ 1}$

Highest paramagnetisrn in $+ 2$ oxidation state in 4d series is shown by ${Mn}^{+ 2}$

answer is D.

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Detailed Solution

Correct (4): ${Tc}^{2 +}$

$\begin{aligned} Tc (Z = 43) : 4 d^{5} 5 s^{2} \\ {Tc}^{2 +} = 4 d^{5} 5 s^{0} \\ n = 5, μ_{MM} = \sqrt{35} BM \end{aligned}$

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