Identify the incorrect statement.

'Spin only' magnetic moment is same for which of the following ions?

A. $$\mathrm{Ti}^{3+}$$

B. $$\mathrm{Cr}^{2+}$$

C. $$\mathrm{Mn}^{2+}$$

D. $$\mathrm{Fe}^{2+}$$

E. $$\mathrm{Sc}^{3+}$$

Choose the most appropriate answer from the options given below.

The $$\mathrm{E}^{\circ}$$ value for the $$\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$$ couple is more positive than that of $$\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$$ or $$\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}$$ due to change of

The pair of lanthanoid ions which are diamagnetic is