AP EAMCET202319 May 2023Morning ShiftChemistryd and f Block ElementsActual
Match the following array lll & array l List I (Complex) array & array l List II (Color) array A. [ Ni ( en )₃ ]²⁺ & I. & Green B. [ Ni ( H ₂ O )₄( en ) ]²⁺ & II. Blue C. [ Ni ( H ₂ O )₆ ]²⁺ & III. Pale blue D. [ Ni ( H ₂ O )₆( en )₂ ]²⁺ & IV. Violet array
Options
- AA-IV, B-I, C-III, D-II
- BA-I, B-II, C-III, D-IV
- CA-IV, B-III, C-I, D-II
- DA-I, B-III, C-II, D-IV
Correct answer
C. A-IV, B-III, C-I, D-II
Step-by-step solution
The splitting energy order is (due to strong-field ligand 'en') :- [ Ni ( H ₂ O )₆ ]²⁺ < [ Ni ( H ₂ O )₄( en ) ]²⁺ < [ Ni ( H ₂ O )₂( en )₂ ]²⁺ < [ Ni ( en )₃ ]²⁺ Thus, the colour shifts from large wave length to short or small frequency to high frequency which is from green to pale blue to blue to violet.