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Q)

The pair having the same magnetic moment is :[At. No : $Cr= 24, Mn=25, Fe=26,Co=27$]

$\begin{array}{1 1} (1) [Cr(H_2O)_6]^{2+} \;and\;[CoCl_4]^{2-}\\(2) [Cr(H_2O)_6]^{2+}\;and\;[Fe(H_2O)_6]^{2+} \\(3) [Mn(H_2O)_6]^{2+}\;and \;[Cr(H_2O)_6]^{2+} \\(4)[CoCl_4]^{2-} \;and\;[Fe(H_2O)_6]^{2+} \end{array} $

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