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  4. Magnetic moment of (NH4)2[MnBr4] is B.M.

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Q. Magnetic moment of $(NH_4)_2[MnBr_4]$ is _____ $B.M.$

Odisha JEEOdisha JEE 2009Coordination Compounds

Solution:

$[MnBr_4]^{2-}$ has Mn in +2 state $(d^5$ ion) and in $sp^3$ hybridised
form
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \mu_{eff}=\sqrt{5(5+2)}=5.91\, BM.$

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