Y' is obtained by the decomposition of a substance 'X'. Oxygen present in 'X' is univalent. 'Y' reacts with a neutral oxide and evolves 'Z' which is composed of reddish brown fumes which turns moist blue litmus red. Identify 'X', 'Y' and 'Z'.

Options

A. `H_(2)O_(2),H_(2)" and "CO_(2)`
B. `H_(2)O_(2),O_(2)" and "NO_(2)`
C. `KCIO_(3),Cl_(2)" and "O_(2)`
D. `HgO,O_(2)" and "NO`

Explanation

To solve the problem, we need to identify substances X, Y, and Z based on the given clues. Let's break it down step by step.

### Step 1: Identify Substance X
- The problem states that "Y is obtained by the decomposition of a substance 'X'."
- It also mentions that "Oxygen present in 'X' is univalent."
- Univalent means that the valency of oxygen in this case is 1.
- The only common substance that fits this description is **Hydrogen Peroxide (H₂O₂)**. In H₂O₂, the oxidation state of oxygen is -1, which is univalent.

### Step 2: Identify Substance Y
- Since Y is obtained from the decomposition of X (H₂O₂), we need to consider the decomposition reaction of hydrogen peroxide.
- When H₂O₂ decomposes, it produces water (H₂O) and oxygen gas (O₂). Therefore, **Y = O₂ (Oxygen gas)**.

### Step 3: Identify Substance Z
- The problem states that "Y reacts with a neutral oxide and evolves 'Z' which is composed of reddish-brown fumes."
- A common neutral oxide is nitrogen dioxide (NO₂), which can react with oxygen.
- When oxygen (Y) reacts with nitrogen dioxide (NO₂), it can produce nitrogen tetroxide (N₂O₄) and nitrogen monoxide (NO), which can further react to produce reddish-brown fumes of nitrogen dioxide (NO₂).
- The reddish-brown fumes that turn moist blue litmus red indicate the presence of an acidic gas, which is **Z = NO₂ (Nitrogen Dioxide)**.

### Final Identification
- **X = Hydrogen Peroxide (H₂O₂)**
- **Y = Oxygen (O₂)**
- **Z = Nitrogen Dioxide (NO₂)**