The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are :

The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thalliumare basic.

Among the following species, the diamagnetic molecule is

The peptide that gives positive ceric ammonium nitrate and carbylamine tests is :