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. |
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