Which of the following will give `NO_(2)` when heated?

Options

A. `LiNO_(3)`
B. `NaNO_(3)`
C. `Al(NO_(3))_(2)`
D. `AgNO_(3)`

Answer

To determine which of the given compounds will produce nitrogen dioxide (NO₂) when heated, we will analyze each option one by one.

### Step 1: Analyze Lithium Nitrate (LiNO₃)
When lithium nitrate is heated, the reaction can be represented as follows:

\[ 2 \text{LiNO}_3 \rightarrow \text{Li}_2\text{O} + 4 \text{NO}_2 + \text{O}_2 \]

**Conclusion:** Lithium nitrate produces nitrogen dioxide when heated.

### Step 2: Analyze Sodium Nitrate (NaNO₃)
When sodium nitrate is heated, the reaction is:

\[ 2 \text{NaNO}_3 \rightarrow 2 \text{NaNO}_2 + \text{O}_2 \]

**Conclusion:** Sodium nitrate does not produce nitrogen dioxide when heated.

### Step 3: Analyze Aluminum Nitrate (Al(NO₃)₃)
When aluminum nitrate is heated, the reaction can be represented as:

\[ 2 \text{Al(NO}_3\text{)}_3 \rightarrow \text{Al}_2\text{O}_3 + 6 \text{NO}_2 + 3 \text{O}_2 \]

**Conclusion:** Aluminum nitrate produces nitrogen dioxide when heated.

### Step 4: Analyze Silver Nitrate (AgNO₃)
When silver nitrate is heated, the reaction is:

\[ 2 \text{AgNO}_3 \rightarrow 2 \text{Ag} + 2 \text{NO}_2 + \text{O}_2 \]

**Conclusion:** Silver nitrate produces nitrogen dioxide when heated.

### Final Summary
The compounds that produce nitrogen dioxide (NO₂) when heated are:
- **Lithium Nitrate (LiNO₃)**
- **Aluminum Nitrate (Al(NO₃)₃)**
- **Silver Nitrate (AgNO₃)**

### Correct Options:
- a. Lithium Nitrate
- c. Aluminum Nitrate
- d. Silver Nitrate