The number of subshells associated with n = 4 and m = –2 quantum numbers is

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mn⁺ ion are provided below; their $$\lambda $$_max values are marked as A, B and C respectively. The correct match between the complexes and their $$\lambda $$_max values is
(i) [M(NCS)₆]^{(–6 + n)}
(ii) [MF₆]^{(–6 + n)}
(iii) [M(NH₃)₆]ⁿ⁺

The one that is not expected to show isomerism is :