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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Select the set having incorrect statements given here. (i) Manganese exhibits +7 oxidation state (ii) Zinc forms coloured ions (iii) [ Co F 6 ] 3 - is diamagnetic (iv) Sc forms +4 oxidation state (v) Zn exhibits only +2 oxidation state

Options

  1. A(i), (ii) and (iii)
  2. B(ii), (iii) and (iv)
  3. C(i), (iii) and (iv)
  4. D(i), (iii) and (v)

Correct answer

B. (ii), (iii) and (iv)

Step-by-step solution

Outer electronic configuration of Mn is 3 d 5 4 s 2 which means it can show +7 oxidation state also (correct) Zinc does not form coloured ions as it has completely filled 3 d 10 4 s 2 configuration. In [ Co F 6 ] 3 - , C o 3 + is a d 6 system. Fluoride is a weak field ligand and hence it can not cause pairing of electrons. Sc can show a maximum of +3 oxidation state as it has an outer electronic configuration of 3 d 1 4 s 2 . Zn exhibits only +2 oxidation state as this oxidation state is the most stable one for it.

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