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Question:

Following are the transition metal ions of 3d series: Ti4+, V2+, Mn3+, Cr3+ (Atomic numbers: Ti=22, V=23, Mn=25, Cr=24). Answer the following: (i) Which ion is most stable in an aqueous solution and why?

Solution:

(i) Ti4+ is most stable as it has a completely filled 3p orbital. (ii) Mn3+ is the strongest oxidizing agent as it requires only one electron to half fill its 3d orbital. (iii) Ti4+ will be colorless due to its empty 3d orbital.