Among the following ,what is the total number of speices which are very good oxidising agents/reducing agents/neither oxidising nor reducing ones ?
a. `F_(2)`
b. `F^(ө)`
c. `Na`
d. `Na^(o+)`
e. `MnO_(4)^(ө)`
f. `I^(ө)`
`Cl^(ө)`
h. `Ce^(4+)`
i. `Cr_(2)O_(7)^(2-)`
j. `CrO_(4)^(2-)`
k. `HNO_(3)`
l. `Fe^(2+)`

Explanation

To determine the total number of species that are good oxidizing agents, reducing agents, or neither, we will analyze each species provided in the question.

### Step-by-Step Solution:

1. **Identify the Species**:
- a. `F_(2)`
- b. `F^(−)`
- c. `Na`
- d. `Na^(+)`
- e. `MnO_(4)^(−)`
- f. `I^(−)`
- g. `Cl^(−)`
- h. `Ce^(4+)`
- i. `Cr_(2)O_(7)^(2−)`
- j. `CrO_(4)^(2−)`
- k. `HNO_(3)`
- l. `Fe^(2+)`

2. **Analyze Each Species**:
- **`F_(2)`**:
- Oxidation state changes from 0 to -1 (F2 → 2F−).
- Acts as a **good oxidizing agent**.
- **`F^(−)`**:
- Oxidation state changes from -1 to 0 (2F− → F2).
- Acts as a **reducing agent**.
- **`Na`**:
- Oxidation state changes from 0 to +1 (Na → Na+).
- Acts as a **good reducing agent**.
- **`Na^(+)`**:
- Oxidation state changes from +1 to 0 (Na+ → Na).
- Acts as an **oxidizing agent**, but not a good one.
- **`MnO_(4)^(−)`**:
- Manganese in +7 state can be reduced to +2 or +4.
- Acts as a **very good oxidizing agent**.
- **`I^(−)`**:
- Oxidation state changes from -1 to 0 (2I− → I2).
- Acts as a **reducing agent**.
- **`Cl^(−)`**:
- Oxidation state changes from -1 to 0 (2Cl− → Cl2).
- Acts as a **reducing agent**.
- **`Ce^(4+)`**:
- Can be reduced to +3.
- Acts as a **very good oxidizing agent**.
- **`Cr_(2)O_(7)^(2−)`**:
- Chromium in +6 state can be reduced.
- Acts as a **very good oxidizing agent**.
- **`CrO_(4)^(2−)`**:
- Chromium also in +6 state can be reduced.
- Acts as a **very good oxidizing agent**.
- **`HNO_(3)`**:
- Nitrogen in +5 state can be reduced.
- Acts as a **very good oxidizing agent**.
- **`Fe^(2+)`**:
- Oxidation state changes from +2 to +3 (Fe2+ → Fe3+).
- Acts as a **very good reducing agent**.

3. **Count the Species**:
- **Good Oxidizing Agents**: `F_(2)`, `MnO_(4)^(−)`, `Ce^(4+)`, `Cr_(2)O_(7)^(2−)`, `CrO_(4)^(2−)`, `HNO_(3)` (Total: 6)
- **Good Reducing Agents**: `F^(−)`, `Na`, `I^(−)`, `Cl^(−)`, `Fe^(2+)` (Total: 5)
- **Neither**: `Na^(+)` (Total: 1)

4. **Total Count**:
- Good oxidizing agents: 6
- Good reducing agents: 5
- Neither: 1
- **Total Species**: 6 (oxidizing) + 5 (reducing) + 1 (neither) = **12 species**.

### Final Answer:
The total number of species which are very good oxidizing agents, reducing agents, or neither oxidizing nor reducing ones is **12**.