Bleaching powder contains a salt of an oxoacid as one of its components . The anhydride of that acid is

Options

A. `Cl_(2)O`
B. `Cl_(2)O_(7)`
C. `ClO_(7)`
D. `Cl_(2)O_(6)`

Answer

To solve the question regarding the anhydride of the oxoacid present in bleaching powder, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Composition of Bleaching Powder**:
Bleaching powder is chemically known as calcium hypochlorite and has the formula \( \text{Ca(OCl)}_2 \).

2. **Determine the Oxoacid**:
The hypochlorite ion (\( \text{OCl}^- \)) is derived from the oxoacid hypochlorous acid (\( \text{HOCl} \)). Therefore, the oxoacid associated with bleaching powder is hypochlorous acid.

3. **Find the Anhydride of the Oxoacid**:
The anhydride of an oxoacid can be formed by the dehydration (removal of water) of two molecules of the acid. For hypochlorous acid:
\[ 2 \text{HOCl} \rightarrow \text{Cl}_2\text{O} + \text{H}_2\text{O} \]
Here, \( \text{Cl}_2\text{O} \) is formed as the anhydride.

4. **Conclusion**:
Thus, the anhydride of the oxoacid (hypochlorous acid) present in bleaching powder is \( \text{Cl}_2\text{O} \).

### Final Answer:
The anhydride of the oxoacid present in bleaching powder is \( \text{Cl}_2\text{O} \).

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