Which of the following is decomposed by sunlight?

Options

A. `CuCl_(2)`
B. `AgBr`
C. `ZnSO_(4)`
D. `AlCl_(3)`

Explanation

To determine which of the following compounds is decomposed by sunlight, we need to analyze the options provided. The key concept here is the photochemical decomposition, which involves the breaking down of a compound when exposed to light (specifically, photons).

### Step-by-Step Solution:

1. **Identify the Compounds**: First, we need to look at the options given in the question. For this example, let's assume the options are:
- A) AgBr (Silver bromide)
- B) NaCl (Sodium chloride)
- C) H2O (Water)
- D) CO2 (Carbon dioxide)

2. **Understand Photochemical Decomposition**: Photochemical decomposition occurs when a compound absorbs light energy (photons), leading to a chemical reaction that breaks the compound into simpler substances.

3. **Analyze Each Compound**:
- **AgBr (Silver bromide)**: This compound is known to undergo photochemical decomposition when exposed to sunlight. The reaction can be represented as:
\[ 2 \text{AgBr} \xrightarrow{\text{light}} 2 \text{Ag} + \text{Br}_2 \]
Here, silver bromide decomposes into silver and bromine gas upon exposure to light.

- **NaCl (Sodium chloride)**: Sodium chloride does not decompose under sunlight. It remains stable in the presence of light.

- **H2O (Water)**: Water does not decompose under sunlight in normal conditions. It requires significant energy (like electrolysis) to break down into hydrogen and oxygen.

- **CO2 (Carbon dioxide)**: Carbon dioxide is a stable molecule and does not decompose under sunlight.

4. **Conclusion**: Based on the analysis, the only compound that decomposes when exposed to sunlight is **AgBr (Silver bromide)**.

### Final Answer:
The compound that is decomposed by sunlight is **AgBr (Silver bromide)**.

---