A compound `(A)` gives brick red flame and breaks down on heating giving oxygen and brown gas. `(A)` is

Options

A. `Na and Na_(2)O_(2)`
B. `Ba and BaO_(2)`
C. `Ca(NO_(3))_(2)`
D. `Ca and CaO`

Explanation

To solve the question, we need to identify the compound `(A)` based on the clues provided: it gives a brick red flame and breaks down on heating to produce oxygen and a brown gas.

### Step-by-Step Solution:

1. **Identify the Flame Color**: The first clue is that the compound gives a brick red flame. In chemistry, specific elements are known to produce characteristic flame colors. For example, calcium is known to produce a brick red flame when burned.

2. **Consider the Decomposition Reaction**: The second clue is that the compound breaks down upon heating, releasing oxygen and a brown gas. We need to think of compounds that decompose to produce these products.

3. **Identify Possible Compounds**: One common compound that fits the description is calcium nitrate, which has the formula \( Ca(NO_3)_2 \).

4. **Write the Decomposition Reaction**: When calcium nitrate is heated, it decomposes according to the following reaction:
\[ 2 Ca(NO_3)_2 \rightarrow 2 CaO + 2 O_2 + 4 NO_2 \]
In this reaction, calcium oxide (\( CaO \)) is produced along with oxygen gas (\( O_2 \)) and nitrogen dioxide (\( NO_2 \)), which is a brown gas.

5. **Conclusion**: Since calcium nitrate produces a brick red flame and decomposes to give oxygen and a brown gas, we can conclude that the compound \( (A) \) is calcium nitrate.

### Final Answer:
The compound \( (A) \) is calcium nitrate, \( Ca(NO_3)_2 \).

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