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Q.

What will be the theoretical value of 'spin only' magnetic moment when Fe(SCN)3 reacts with a solution containing F- ions to yield a colourless complex?

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a

1. 73 BM

b

3.87 BM

c

5.92 BM

d

2.83 BM

answer is C.

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Detailed Solution

Since FeF63− has five electrons the value of B.M. is

Fe(SCN)3+3F−→FeF3+3SCN−

Magnetic moment is,

μ=n+(n+2)μ=5×7μ=35μ=5.92BM

Hence correct option is C

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