KVPY SX SB Exam 2012 Question Paper

Question : 54 of 120

Marks: +1, -0

For a tetrahedral complex

[\MCl_4]^{2-}

the spin-only magnetic moment is 3.83 BM. The element M is

Solution:

[\MCl_4]^{2–}

Tetrahedral =

sp^3

hybridisation

\M^{+2}

∵\µ=√{n(n+2)}B.M=3.83

n = 3
Means configuration of

M^{+2} = 3d^7

so,

M = 3d^7 4s^2 = _ 27Co

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