`Cl_2 + NH_3` (excess) `to A+B`

Options

A. (A) One of the product Is also obtained by decomposition of `(NH_4)_2Cr_2O_7`
B. (B)If `Br_2` is used instead of `Cl_2`, one of product remain same
C. (C) Both products contain chlorine.
D. (D) One of the product is `NH_(4)Cl`

Answer

To solve the reaction of chlorine gas (Cl₂) with ammonia (NH₃) in excess, we will break down the process step by step.

### Step 1: Write the Reactants
The reactants in this reaction are chlorine gas (Cl₂) and ammonia (NH₃). We are given that ammonia is in excess.

### Step 2: Identify the Reaction
When chlorine reacts with ammonia, the primary products formed are ammonium chloride (NH₄Cl) and nitrogen gas (N₂). The reaction can be represented as follows:

\[ Cl_2 + 2NH_3 \rightarrow 2NH_4Cl + N_2 \]

### Step 3: Balance the Reaction
To ensure that the reaction is balanced, we check the number of atoms of each element on both sides of the equation.

- **Left Side:**
- Chlorine (Cl): 2
- Nitrogen (N): 2
- Hydrogen (H): 6 (from 2 NH₃)

- **Right Side:**
- Chlorine (Cl): 2 (from 2 NH₄Cl)
- Nitrogen (N): 2 (1 from N₂ and 2 from 2 NH₄Cl)
- Hydrogen (H): 8 (from 2 NH₄Cl)

The balanced equation is:

\[ Cl_2 + 2NH_3 \rightarrow 2NH_4Cl + N_2 \]

### Step 4: Identify the Products
From the balanced equation, we can see that the products of the reaction are:
- Ammonium chloride (NH₄Cl)
- Nitrogen gas (N₂)

### Step 5: Analyze the Options
Now, we need to analyze the options given in the question:
1. One of the products is also obtained by the decomposition of ammonium dichromate.
2. If bromine is used instead of chlorine, one other product remains the same.
3. Both products contain chlorine.
4. One other product is ammonium chloride.

#### Evaluation of Options:
- **Option 1**: Correct. Nitrogen gas is also produced from the decomposition of ammonium dichromate.
- **Option 2**: Correct. Bromine reacts with ammonia to form ammonium bromide and nitrogen gas, so nitrogen gas remains the same.
- **Option 3**: Incorrect. Only ammonium chloride contains chlorine, while nitrogen gas does not.
- **Option 4**: Correct. One of the products is ammonium chloride.

### Conclusion
The correct options based on the analysis are A, B, and D.

### Final Answer:
The correct options are A, B, and D.

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