Among the following compounds, which on heating do not produce `N_(2)` ?

Options

A. `(NH_(4))_(2)Cr_(2)O_(7)`
B. `NH_(4)Cl+NaNO_(2)`
C. `NH_(4)Cl+CaO`
D. `Ba(N_(3))_(2)`

Explanation

To solve the question of which compounds do not produce nitrogen gas (N₂) upon heating, we will analyze each compound listed and their respective reactions.

### Step-by-Step Solution:

1. **Identify the Compounds:**
We need to analyze the following compounds:
- NH₄Cr₂O₇ (Ammonium dichromate)
- NH₄Cl + NaNO₂ (Ammonium chloride with sodium nitrite)
- NH₄Cl + CaO (Ammonium chloride with calcium oxide)
- Ba(N₃)₂ (Barium azide)

2. **Analyze the First Compound (NH₄Cr₂O₇):**
- When ammonium dichromate is heated, it decomposes to produce nitrogen gas, water, and chromium(III) oxide.
- **Reaction:**
\[ 2 NH_4Cr_2O_7 \rightarrow N_2 + 4 H_2O + Cr_2O_3 \]
- **Conclusion:** Produces N₂.

3. **Analyze the Second Compound (NH₄Cl + NaNO₂):**
- When ammonium chloride reacts with sodium nitrite, nitrogen gas is produced along with water and sodium chloride.
- **Reaction:**
\[ NH_4Cl + NaNO_2 \rightarrow N_2 + H_2O + NaCl \]
- **Conclusion:** Produces N₂.

4. **Analyze the Third Compound (NH₄Cl + CaO):**
- When ammonium chloride is heated with calcium oxide, it yields calcium chloride, ammonia gas, and water.
- **Reaction:**
\[ 2 NH_4Cl + CaO \rightarrow CaCl_2 + 2 NH_3 + H_2O \]
- **Conclusion:** Does NOT produce N₂ (produces NH₃ instead).

5. **Analyze the Fourth Compound (Ba(N₃)₂):**
- Barium azide decomposes upon heating to produce barium and nitrogen gas.
- **Reaction:**
\[ Ba(N_3)_2 \rightarrow Ba + N_2 \]
- **Conclusion:** Produces N₂.

### Final Conclusion:
The compound that does not produce nitrogen gas (N₂) upon heating is **NH₄Cl + CaO** (Option C).

### Summary of Results:
- **Produces N₂:** NH₄Cr₂O₇, NH₄Cl + NaNO₂, Ba(N₃)₂
- **Does NOT Produce N₂:** NH₄Cl + CaO