Given below are two statements: Statement I: The number of pairs among [ Ti ⁴⁺, V ²⁺] , [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] and [ V ²⁺, Cr ²⁺] in which both ions are coloured is 3 . Statement II: The number of pairs among [ La ³⁺, Yb ²⁺] , [ Lu ³⁺, Ce ⁴⁺] and [ Ac ³⁺, Lr ³⁺] ions in which both are diamagnetic is 3 . In the light of the above statements, choose the correct from the options given below:

Step-by-step solution

For Statement I: The electronic configurations of the given transition metal ions are: Ti ⁴⁺ : 3d^0 (colourless due to absence of unpaired electrons) V ²⁺ : 3d^3 (coloured) Mn ²⁺ : 3d^5 (coloured) Fe ³⁺ : 3d^5 (coloured) Cr ²⁺ : 3d^4 (coloured) The pairs in which both ions are coloured are [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] , and [ V ²⁺, Cr ²⁺] . The pair [ Ti ⁴⁺, V ²⁺] contains Ti ⁴⁺ which is colourless. Thus, there are exactly 3 pairs where both ions are coloured. Statement I is correct. For Statement II: The elect