question_answer

Pick out the correct statement(s).

1. Manganese exhibits + 7 oxidation state

2. Zinc forms coloured ions

3.\[{{[Co{{F}_{6}}]}^{3-}}\]is diamagnetic

4. Sc forms +4 oxidation state

5. Zn exhibits only +2 oxidation state

A)  1 and 2                

B)  1 and 5

C)  2 and 4                

D)         3 and 4

E)  2 and 5

Correct Answer: B

Solution :

1. Electronic configuration of\[Mn\]is\[3{{d}^{5}},4{{s}^{2}}\] and hence, it exhibits + 7 oxidation state.

2. Zinc does not form colored ions as it has completely filled\[3{{d}^{10}},4{{s}^{2}}\]configuration.

3. In\[{{[Co{{F}_{6}}]}^{3-}},\]fluoride is a weak field ligand and hence, does not cause pairing of electrons in\[{{d}^{7}}\]system of\[C{{o}^{3+}}\]. Thus, the complex is paramagnetic. Electronic configuration of\[C{{o}^{3+}}\] is

4. Sc has outer configuration of\[3{{d}^{1}}4{{s}^{2}},\]hence it can form a maximum of + 3 oxidation state.

5. Zn exhibits only + 2 oxidation state as in this it is the most stable.