The paramagnetic complex ion which has no unpaired electrons in $t_2 g$ orbitals is

1. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
2. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$
3. $\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_6\right]^{2+}$
4. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$

Solution

$\left[\mathrm{Ni}_{( }\left(\mathrm{NH}_3\right)_6\right]^{+2}$
In $t_{2 g}$ all electrons are paired.

Asked in: AP EAMCET 2024 (20 May Shift 1)

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