$M n^{2 +}$ forms a complex with $B r^{-}$ ion. The magnetic moment of complex is $5.92 B M$ . The probable formula and geometry of the complex, are

[M n B r_{6}]^{2 -}, Octahedral

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[M n B r_{5}]^{3 -}, Trigonal planar

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[M n B r_{4}]^{2 -}, Square planar

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[M n B r_{4}]^{2 -}, Tetrahedral

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Solution

The correct option is D $[M n B r_{4}]^{2 -}, Tetrahedral$
$\sqrt{n (n + 2)} = 5.92$
$n = 5$

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