….is obtained when ammonium dichromate is heated.

Options

A. nitrogen
B. oxygen
C. ammonia
D. none

Answer

To determine the products obtained when ammonium dichromate is heated, we can follow these steps:

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

### Step 2: Understand the reaction upon heating.
When ammonium dichromate is heated, it undergoes a decomposition reaction.

### Step 3: Write the balanced chemical equation for the decomposition.
The decomposition of ammonium dichromate can be represented as:
\[ \text{NH}_4\text{Cr}_2\text{O}_7 (s) \rightarrow \text{Cr}_2\text{O}_3 (s) + \text{N}_2 (g) + \text{H}_2\text{O} (g) \]

### Step 4: Identify the products.
From the balanced equation, we can see that the products obtained are:
- Chromium(III) oxide (\( \text{Cr}_2\text{O}_3 \)), which is a solid.
- Nitrogen gas (\( \text{N}_2 \)).
- Water vapor (\( \text{H}_2\text{O} \)).

### Conclusion:
Thus, when ammonium dichromate is heated, the products obtained are chromium(III) oxide, nitrogen gas, and water vapor.

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