A chemical A is used for the preparation of washing soda to recover ammonia. When `CO_(2)` is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?

Options

A. `Ca(HCO_(3))_(2)`
B. `CaO`
C. `Ca(OH)_(2)`
D. `CaCO_(3)`

Explanation

To solve the question, we need to identify the chemical A based on the clues provided. Let's break down the information step by step:

### Step 1: Identify the Uses of Chemical A
The question states that chemical A is used for the preparation of washing soda and to recover ammonia. Washing soda is sodium carbonate (Na2CO3), and one of the processes to produce it is the Solvay process, which involves calcium compounds.

**Hint:** Look for chemicals involved in the Solvay process or those that can produce washing soda.

### Step 2: Analyze the Reaction with CO2
The question mentions that when CO2 is bubbled through an aqueous solution of A, the solution turns milky. This is a characteristic reaction of calcium hydroxide (Ca(OH)2), which forms calcium carbonate (CaCO3) when CO2 is introduced, resulting in a milky solution.

**Hint:** Consider reactions that produce a precipitate when CO2 is introduced.

### Step 3: Identify the Disinfectant Nature
The question also states that chemical A is used in whitewashing due to its disinfectant nature. Calcium hydroxide is commonly used for whitewashing because it has antimicrobial properties.

**Hint:** Think about common disinfectants used in construction and sanitation.

### Step 4: Conclusion
Based on the above analysis, the chemical A is calcium hydroxide (Ca(OH)2). It meets all the criteria: it is used in the preparation of washing soda, it reacts with CO2 to form a milky solution of calcium carbonate, and it is used in whitewashing due to its disinfectant properties.

### Final Answer
The chemical formula of A is **Ca(OH)2** (calcium hydroxide).

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