Bleaching power is a mixed salt of hydrochloric acid and hypochlorious acid. It has the formula, `CaOCI_(2).H_(2)O`. It is manuafactured by the action of chlorine on dry slaked lime at `40^(@)C`. There is also a view that bleaching power is a mixture `[Ca(OCI)_(2)+CaCI_(2).Ca(OH)_(2).H_(2)O]`. The amount of chlorine obtained form a sample of bleching power by the treatement with excess of dilute acids or `CO_(2)` is called a available chlorine. A good sample of bleaching power constains `35-38%` of available chlorine. On long standing, it undergoes auto-oxidation and the amount of acvailable chlorine decreases. The estimation of available chlorine is done volumetrically by (a) iodometric method or by (b) aresenite method. In textile industry, the cotton cloth is mainly bleached with the help of bleaching power.
On long standing, the bleaching power undergoes auto-oxidation. The products formed are

Options

A. Calcium chloride only
B. Calcium chlorate only
C. Calcium chloride and calcium chlorate
D. Calcium chloride and calcium chlorite

Explanation

To determine the products formed when bleaching powder undergoes auto-oxidation, we can follow these steps:

### Step 1: Understand the Composition of Bleaching Powder
Bleaching powder, also known as calcium oxychloride, has the formula \( \text{Ca(OCl)}_2 \cdot \text{H}_2\text{O} \). It is produced by the reaction of chlorine with dry slaked lime.

### Step 2: Identify the Process of Auto-Oxidation
Auto-oxidation refers to the spontaneous oxidation that occurs over time when bleaching powder is stored. This process leads to the breakdown of the bleaching powder into other chemical species.

### Step 3: Write the Decomposition Reaction
When bleaching powder undergoes auto-oxidation, it decomposes to form calcium chloride (\( \text{CaCl}_2 \)) and calcium chlorate (\( \text{Ca(ClO}_3)_2 \)). The simplified reaction can be represented as:
\[ \text{Ca(OCl)}_2 \rightarrow \text{CaCl}_2 + \text{Ca(ClO}_3)_2 \]

### Step 4: Balancing the Reaction
To balance the reaction, we can multiply the reactants and products appropriately. The balanced equation can be represented as:
\[ 6 \text{Ca(OCl)}_2 \rightarrow 5 \text{CaCl}_2 + \text{Ca(ClO}_3)_2 \]

### Step 5: Identify the Products
From the balanced reaction, we can see that the products formed from the auto-oxidation of bleaching powder are:
- Calcium Chloride (\( \text{CaCl}_2 \))
- Calcium Chlorate (\( \text{Ca(ClO}_3)_2 \))

### Conclusion
Thus, the products formed when bleaching powder undergoes auto-oxidation are Calcium Chloride and Calcium Chlorate.

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