Bleaching powder reacts with excess dil acid to liberate chlorine which is called

Options

A. Nascent Chlorine
B. Availabe Chlorine
C. Active Chlorine
D. Atomic Chlorine

Explanation

To solve the question regarding the reaction of bleaching powder with excess dilute acid to liberate chlorine, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The main reactant in this case is bleaching powder, which is chemically known as calcium oxychloride (Ca(OCl)2). The excess dilute acid typically used is sulfuric acid (H2SO4).

2. **Write the Reaction**: When bleaching powder reacts with dilute sulfuric acid, the reaction can be represented as:
\[ \text{Ca(OCl)}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + \text{H}_2\text{O} + \text{Cl}_2 \]
In this reaction, chlorine gas (Cl2) is liberated.

3. **Understand the Type of Chlorine Released**: The question asks for the name of the chlorine that is liberated during this reaction. The options provided are:
- Nascent chlorine
- Available chlorine
- Active chlorine
- Atomic chlorine

4. **Eliminate Incorrect Options**:
- **Nascent Chlorine**: This term refers to chlorine in a very reactive state, often produced in reactions where chlorine is generated in situ (in the reaction). Since Cl2 is a diatomic molecule, it does not qualify as nascent chlorine.
- **Atomic Chlorine**: This refers to chlorine in its atomic form (Cl), which is not the case here since Cl2 is diatomic.
- **Active Chlorine**: This term is not commonly used in this context and can be ambiguous.

5. **Identify the Correct Option**: The term that best describes the chlorine liberated in this reaction is **Available Chlorine**. Available chlorine refers to the amount of chlorine that can be released from bleaching powder during the reaction, which is a measure of its bleaching capability.

6. **Conclusion**: Therefore, the correct answer to the question is **Available Chlorine**.

### Final Answer:
The chlorine liberated from the reaction of bleaching powder with excess dilute acid is called **Available Chlorine**.

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