Thermal decompostion of ammonium dichromate produces gas and steam.

Options

A. `NH_(3),Cr_(2)O_(3) and H_(2)O`
B. `N_(2),Cr_(2)O_(3) and H_(2)O`
C. `NO,CrO_(3) and H_(2)O`
D. `N_(2)O, CrO_(3) and H_(2)O`

Answer

To solve the problem regarding the thermal decomposition of ammonium dichromate, we will follow these steps:

### Step 1: Write the formula of ammonium dichromate
The chemical formula for ammonium dichromate is:
\[ \text{(NH}_4\text{)}_2\text{Cr}_2\text{O}_7 \]

### Step 2: Understand the thermal decomposition process
When ammonium dichromate is heated, it undergoes thermal decomposition. This means that it breaks down into simpler substances when heat is applied.

### Step 3: Write the balanced chemical equation for the decomposition
The thermal decomposition of ammonium dichromate can be represented by the following balanced equation:
\[ \text{(NH}_4\text{)}_2\text{Cr}_2\text{O}_7 \xrightarrow{\text{heat}} \text{N}_2 + \text{Cr}_2\text{O}_3 + 4\text{H}_2\text{O} \]

### Step 4: Identify the products formed
From the balanced equation, we can see that the products of the thermal decomposition are:
- Nitrogen gas (\( \text{N}_2 \))
- Chromium(III) oxide (\( \text{Cr}_2\text{O}_3 \))
- Water (\( \text{H}_2\text{O} \))

### Step 5: Conclusion
Thus, the thermal decomposition of ammonium dichromate produces nitrogen gas, chromium(III) oxide, and water (steam). The correct answer matches with option B, which states that the products are \( \text{N}_2 \), \( \text{Cr}_2\text{O}_3 \), and water.

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