Select incorrect statement :

Options

A. `ClO_(2)` and `Cl_(2)O` are used as bleaching agents for paper pulp and textiles.
B. `O Cl^(-)` (hypohalites) salts are used as detergent.
C. `O Cl^(-)` disproportionates in alkaline medium.
D. `BrO_(3)^(-)` is oxidised to `Br_(2)` by `Br^(-)` in acidic medium.

Answer

To solve the question of identifying the incorrect statement among the given options, we can follow these steps:

### Step 1: Analyze the first statement
- **Statement**: ClO2 and Cl2O are used as bleaching agents for paper pulp and textiles.
- **Analysis**: Both ClO2 (chlorine dioxide) and Cl2O (dichlorine monoxide) are known to release nascent oxygen, which acts as a bleaching agent. Therefore, this statement is **true**.

### Step 2: Analyze the second statement
- **Statement**: OCl- (hypochlorite) salts are used as detergents.
- **Analysis**: Hypochlorite salts are indeed used in various cleaning products and detergents due to their bleaching and disinfecting properties. Thus, this statement is also **true**.

### Step 3: Analyze the third statement
- **Statement**: OCl- disproportionates in alkaline medium.
- **Analysis**: Disproportionation is a reaction where a species is simultaneously oxidized and reduced. In alkaline medium, OCl- can undergo the following reaction:
\[ 3 \text{OCl}^- \rightarrow \text{Cl}_2 + \text{ClO}_3^- + 2 \text{OH}^- \]
Here, the oxidation states of chlorine change, confirming that OCl- does indeed disproportionate. Therefore, this statement is **true**.

### Step 4: Analyze the fourth statement
- **Statement**: BrO3- is oxidized to Br2 by Br- in acidic medium.
- **Analysis**: In acidic medium, BrO3- (bromate ion) does not get oxidized by Br- (bromide ion) to form Br2. Instead, BrO3- is a strong oxidizing agent and typically oxidizes Br- to Br2. Therefore, this statement is **false** or **incorrect**.

### Conclusion
The incorrect statement among the options provided is:
- **D**: BrO3- is oxidized to Br2 by Br- in acidic medium.

### Final Answer
The incorrect statement is **D**.

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