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Question

If the atomic number of an element is 26, the magnetic moment (in Bohr magneton) shown by its ion in +2 oxidation state will be:

A
1.75
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B
2.86
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C
3.87
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D
4.90
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Solution

The correct option is D 4.90
It is given that if an element has atomic number as 26 and its ion is in +2 oxidation state, then its electronic configuration will be d6 with 4 unpaired electrons.

The formula for the magnetic moment is n(n+2), where n is the number of unpaired electrons.

Hence, its magnetic moment is 4(4+2)=4.90 Bohr magneton

Option D is correct.

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