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Colored ion among the following is

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Zn²⁺

Mn²⁺

Cu¹⁺

Ti⁴⁺

answer is B.

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Detailed Solution

Transition metal ions with incompletely filled d orbitals are colored.
Mn²⁺are colored due to d-d transition in incompletely filled d orbitals.
Atomic number of Mn=25
Electronic config ⇒1s²2s²2p⁶3s²3p⁶4s²3d⁵
Mn²⁺⇒1s²2s²2p⁶3s²3p⁶4s⁰3d⁵
Zn²⁺,Ti⁴⁺,Cu¹⁺are color less due to completely field d orbitals.

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