The pair of ions which do not have same number of unpaired electrons is

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Mn²⁺ and Fe³⁺

Ti²⁺ and Ni²⁺

Cu²⁺ and Ti³⁺

Fe²⁺ and Ni²⁺

answer is D.

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Detailed Solution

The electronic configurations:

Fe²⁺ (26) 4s⁰3d⁶ =4 unpaired electrons

Mn²⁺ (25)4s⁰3d⁵=5 unpaired electrons

Ni²⁺ (28)4s⁰3d⁸ =2 unpaired electrons

Cu²⁺ (29)4s⁰3d⁹=1 unpaired electron

Ti⁺² (22) 4s⁰3d² =2 unpaired electrons

Ti⁺³ (22) 4s⁰3d¹ =1 unpaired electron

Fe³⁺ (26) 4s⁰3d⁵=5 unpaired electrons

Hence, the correct option is option (D) Fe²⁺ and Ni²⁺

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