Engineering
Chemistry
d Block Elements and Properties
Question

Amongst the following ions, which is considered as most stable in M2+ state?

Ti2+/ Ti(–1.63V)

V2+/ V(–1.11V)

Cr2+ / Cr(– 090V)

Mn2+ / Mn(1.18V)

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Solution

Half reactions with lowest standard reduction have stable reactants (ions).
Here, Ti2+ + 2e → Ti[Reduction]
The standard reduction potential of this reaction is least. So, the reactant Ti2+ is more stable.