A green coloured solution of a salt changes its colour to light pink on passing ozone through it. Which of the following species represent pink and green colour respectively.

Options

A. `Mn^(2+)` and `MnO_2`
B. `MnO_4^(Ө)` and `MnO_4^(2-)`
C. `Co^(2+)` and `Co^(3+)`
D. `MnO_4^(2-)` and `MnO_4^(Ө)`

Explanation

To solve the question regarding the color change of a green-colored salt solution to light pink upon passing ozone through it, we can follow these steps:

### Step 1: Identify the Initial Green Species
The green-colored solution in question is likely to be potassium manganate, which is represented by the formula \( K_2MnO_4 \). In this compound, manganese (Mn) is in the +6 oxidation state.

**Hint:** Look for common manganese compounds that are known to have distinct colors.

### Step 2: Understand the Role of Ozone
Ozone (\( O_3 \)) is a powerful oxidizing agent. When it is passed through the green solution, it oxidizes the manganate ion (\( MnO_4^{2-} \)) to permanganate ion (\( MnO_4^{-} \)), which is pink in color.

**Hint:** Recall the properties of ozone and its ability to oxidize certain ions.

### Step 3: Identify the Final Pink Species
The pink-colored solution is due to the formation of permanganate ion (\( MnO_4^{-} \)). In this ion, manganese is in the +7 oxidation state.

**Hint:** Consider the oxidation states of manganese in both species to differentiate between them.

### Step 4: Write the Reaction
The overall reaction can be summarized as follows:
\[ K_2MnO_4 + O_3 + H_2O \rightarrow 2 KOH + MnO_4^{-} + O_2 \]
This reaction shows the conversion of the green manganate ion to the pink permanganate ion.

**Hint:** Writing the balanced chemical equation can help visualize the transformation of species.

### Step 5: Conclusion
From the above analysis, we conclude that:
- The green species is \( MnO_4^{2-} \) (manganate ion).
- The pink species is \( MnO_4^{-} \) (permanganate ion).

Thus, the answer is:
- Pink species: \( MnO_4^{-} \)
- Green species: \( MnO_4^{2-} \)

**Final Answer:** Pink: \( MnO_4^{-} \), Green: \( MnO_4^{2-} \)