Which of the following pair of transition metal
ions, have the same calculated values of spin
only magnetic moment?

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Ti⁺² and V⁺²

Fe⁺² and Cd⁺²

Cr⁺² and Fe⁺²

Co⁺² and Ti⁺²

answer is C.

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Detailed Solution

Since, the magnetic moment depends on number of unpaired electrons.

electronic configuration of the following elements are:

Fe²⁺=1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶

Cd²⁺=1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰

Cr²⁺=1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶

Co²⁺=1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶

Ti²⁺=1s² 2s² 2p⁶ 3s² 3p⁶ 3d²

Since, Fe²⁺ and Cr²⁺ have the same number of unpaired electrons, that is 4 each, we can conclude that they have the same magnetic moment.

Hence , the correct option is (C).

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