The least stable oxide at room temperature is

Options

A. ZnO
B. CuO
C. `Sb_(2)O_(3)`
D. `Ag_(2)O`

Explanation

To determine the least stable oxide at room temperature, we can follow these steps:

### Step 1: Understand the Concept of Stability in Oxides
Oxides can vary in stability based on their chemical structure and the conditions they are exposed to. Stability refers to how likely a compound is to decompose into its constituent elements or other compounds.

**Hint:** Consider what factors contribute to the stability of a compound, such as bond strength and environmental conditions.

### Step 2: Identify Common Oxides
Common oxides include those of metals and non-metals. Some examples are:
- Silver oxide (Ag2O)
- Copper oxide (CuO)
- Iron oxide (Fe2O3)
- Zinc oxide (ZnO)

**Hint:** Recall which oxides are known for their stability or instability.

### Step 3: Research Known Properties of Silver Oxide
Silver oxide (Ag2O) is known to be unstable at room temperature. It can decompose into silver (Ag) and oxygen (O2) when exposed to heat or light.

**Hint:** Look for specific properties of silver oxide that indicate its stability, such as decomposition temperature and sensitivity to light.

### Step 4: Analyze the Decomposition of Silver Oxide
Silver oxide decomposes at relatively low temperatures (around 200°C) and is also photosensitive, meaning it can decompose upon exposure to light. This indicates that it is less stable compared to other oxides.

**Hint:** Consider how temperature and light exposure affect the stability of the oxide.

### Step 5: Conclude the Answer
Based on the analysis, silver oxide (Ag2O) is identified as the least stable oxide at room temperature due to its tendency to decompose easily under heat and light.

**Final Answer:** The least stable oxide at room temperature is silver oxide (Ag2O).

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