Compound A reacts with `NH_4Cl` and forms a compound B. Compound B reacts with `H_2O `and excess of `CO_2` to form compound C which on passing through or reaction with saturated `NaCl` solution formssodium hydrogen carbonate. Compound A, B and C, are respectively

Options

A. ` CaCl_2, NH_4^+,(NH_4)_2CO_3`
B. `CaCl_2, NH_3, NH_4HCO_3`
C. `Ca(OH)_2, NH_3, NH_4HCO_3`
D. ` Ca(OH)_2,NH_4^+,(NH4)_2CO3`

Answer

To solve the question step by step, we need to identify the compounds A, B, and C based on the reactions described.

### Step 1: Identify Compound A
The question states that Compound A reacts with `NH4Cl`. A common reaction involving `NH4Cl` is with calcium hydroxide, which is `Ca(OH)2`. When calcium hydroxide reacts with ammonium chloride, it produces ammonia gas (`NH3`), calcium chloride (`CaCl2`), and water (`H2O`).

**Reaction:**
\[ \text{Ca(OH)}_2 + 2 \text{NH}_4\text{Cl} \rightarrow 2 \text{NH}_3 + \text{CaCl}_2 + 2 \text{H}_2\text{O} \]

Thus, Compound A is **Calcium hydroxide (Ca(OH)2)**.

### Step 2: Identify Compound B
From the reaction above, we can see that the product formed is ammonia (`NH3`). This ammonia can be considered as Compound B.

### Step 3: Identify Compound C
Next, Compound B (ammonia) reacts with water and excess carbon dioxide to form ammonium bicarbonate (`NH4HCO3`).

**Reaction:**
\[ \text{NH}_3 + \text{H}_2\text{O} + \text{CO}_2 \rightarrow \text{NH}_4\text{HCO}_3 \]

Thus, Compound C is **Ammonium bicarbonate (NH4HCO3)**.

### Step 4: Final Reaction with Sodium Chloride
Finally, the question states that Compound C reacts with saturated sodium chloride solution to form sodium hydrogen carbonate (`NaHCO3`). The reaction can be represented as:

**Reaction:**
\[ \text{NH}_4\text{HCO}_3 + \text{NaCl} \rightarrow \text{NaHCO}_3 + \text{NH}_4\text{Cl} \]

### Conclusion
Based on the above steps, we can summarize:
- Compound A: **Calcium hydroxide (Ca(OH)2)**
- Compound B: **Ammonia (NH3)**
- Compound C: **Ammonium bicarbonate (NH4HCO3)**

### Final Answer
Thus, the compounds A, B, and C are respectively:
- **Calcium hydroxide (Ca(OH)2), Ammonia (NH3), Ammonium bicarbonate (NH4HCO3)**.

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