In which of the following reactions, products given are not correct?

Options

A. `(NH_(4))_(2) Cr_(2) O_(7) overset(Delta)(to) N_(2) + 4H_(2)O + Cr_(2) O_(3)`
B. `Ba(N_(3))_(2) overset(Delta)(to) Ba + 3 N_(2)`
C. `3 Mg + N_(2) overset(Delta) (to) Mg_(3) N_(2)`
D. `NH_(4)Cl + NaNO_(2) to NaCl + NH_(3) + NO_(2)`

Answer

To determine which of the given reactions has incorrect products, we will analyze each option step by step.

### Step 1: Analyze Option 1
**Reaction:** Ammonium dichromate (NH₄)₂Cr₂O₇ on heating.

**Expected Products:**
- When ammonium dichromate is heated, it decomposes to form:
- Chromium(III) oxide (Cr₂O₃), which is green in color.
- Water (H₂O).
- Nitrogen gas (N₂).

**Conclusion:** The products given for this reaction are correct.

### Step 2: Analyze Option 2
**Reaction:** Barium azide (Ba(N₃)₂) on heating.

**Expected Products:**
- Barium azide decomposes to produce:
- Barium (Ba).
- Nitrogen gas (N₂).

**Conclusion:** The products given for this reaction are correct.

### Step 3: Analyze Option 3
**Reaction:** Magnesium (Mg) reacting with nitrogen (N₂).

**Expected Products:**
- When magnesium reacts with nitrogen, it forms:
- Magnesium nitride (Mg₃N₂).

**Conclusion:** The products given for this reaction are correct.

### Step 4: Analyze Option 4
**Reaction:** Ammonium chloride (NH₄Cl) reacting with sodium nitrite (NaNO₂).

**Expected Products:**
- The reaction between ammonium chloride and sodium nitrite should produce:
- Sodium chloride (NaCl).
- Water (H₂O).
- Nitrogen gas (N₂).

**Given Products:** NaCl, NH₃, and NO₂.

**Conclusion:** The products given for this reaction are incorrect. The correct products should be NaCl, water, and N₂.

### Final Answer
The reaction in which the products given are not correct is **Option 4**.

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