Give reason for E ∘ value for ( Mn + 2 / Mn ) is negative whereas for ( Cu + 2 / Cu ) is positive.

Mn 2 + has d 5 configuration (stable half-filled configuration) and it prefers to stay in + 2 oxidation state. So, E ∘ value for Mn 2 + / Mn is negative. Whereas the high energy to transform Cu ( s ) to Cu + 2 (aq) is not balanced by its hydration enthalpy, hence Cu + 2 has positive E ∘ value.

Consider the following standard electrode potentials ( E o in volts) in aqueous solution: E l e m e n t M 3 + / M M + / M A l - 1.66 + 0.55 T l + 1.26 - 0.34 Based on these data, which of the following statements is correct?

T l + is more stable than A l +

T l + is more stable than A l 3 +

A l + is more stable than A l 3 +

T l 3 + is more stable than A l 3 +

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