A compound X reaction with `CO_(2)` present in air to from Y . Y one decomposition produces on oxide . The compound X is .

Options

A. `CaCO_(3)`
B. `CaO`
C. `Ca(HCO_(3))_(2)`
D. `Ca(OH)_(2)`

Explanation

To solve the problem step by step, we need to identify the compound X based on the given reactions.

### Step 1: Understand the Reaction
The question states that a compound X reacts with carbon dioxide (CO₂) to form another compound Y. Then, when Y decomposes, it produces an oxide.

### Step 2: Identify Possible Reactions
One common reaction involving carbon dioxide is the formation of carbonates from oxides. A well-known example is calcium oxide (CaO) reacting with carbon dioxide to form calcium carbonate (CaCO₃).

### Step 3: Write the Reaction
The reaction can be written as:
\[ \text{CaO} + \text{CO}_2 \rightarrow \text{CaCO}_3 \]
Here, CaO is our compound X, and CaCO₃ is our compound Y.

### Step 4: Decompose Compound Y
Next, we need to consider the decomposition of compound Y (CaCO₃). When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide:
\[ \text{CaCO}_3 \xrightarrow{\text{heat}} \text{CaO} + \text{CO}_2 \]

### Step 5: Conclusion
From the above reactions, we can conclude that the compound X is calcium oxide (CaO), as it reacts with CO₂ to form calcium carbonate (Y), which upon decomposition produces calcium oxide again.

### Final Answer
The compound X is **Calcium Oxide (CaO)**.

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