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JEE Advanced levelSingle correct optionDifficulty 3 of 3df035

Which of the following has the highest spin-only magnetic moment?

A $Fe X^{3 +}$
B $Mn X^{2 +}$
Cgaseous Cu atom (ground state)
Dgaseous Cr atom (ground state)

Answer: D

Cr is

3 d^{5} 4 s^{1}

with 6 unpaired electrons,

48 = 6.93 BM

.

Mn X^{2 +}

and

Fe X^{3 +}

are

d^{5}

with 5 unpaired,

5.92 BM

, and Cu (

3 d^{10} 4 s^{1}

) has one,

1.73 BM

. Cr is highest.

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