Pick out the correct statement (s).
1. Manganese exhibits + 7 oxidation state
2. Zinc forms coloured ions
3. `[CoF_(6)]^(3-)` is diamagnetic
4. Sc forms +4 oxidation state
5. Zn exhibits only +2 oxidation state

Options

A. 1 and 2
B. 1 and 5
C. 2 and 4
D. 3 and 4

Answer

B

Explanation

1. Electronic configuration of Mn is `3d^(5), 4s^(2)` and hence, it exhiits +7 oxidation state.
2. Zinc does not form coloured ions as it has completely filled `3d^(10), 4s^(2)` configuration.
3. In `[CoF_(6)]^(3-)`, fluoride is a weak field ligand and hence, does not cause pairing of electrons in `d^(7)` system of `Co^(3+)`. Thus, the complex is paramagnetic.
Electronic configuration of `Co^(3+)` is

4. Sc has outer configuration of `3d^(1) 4s^(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.