Among the following species, the diamagnetic molecule is

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.

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

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ?

(The Bohr radius is represented by a₀)