A compound which is strong oxidizing angent and has orange coloured crystal. It is used in the preparation of azo compounds. Identify the compound.

Options

A. Hydrogen peroxide
B. potassium permaganate
C. sodium chromate
D. potassium dichromate

Answer

To solve the question, we need to identify a compound that is a strong oxidizing agent, has orange-colored crystals, and is used in the preparation of azo compounds. Let's analyze the options step by step.

### Step 1: Analyze the properties of the compound
- **Strong oxidizing agent**: This means the compound must readily accept electrons and facilitate oxidation reactions.
- **Orange-colored crystals**: The color of the crystals is a key identifying characteristic.
- **Used in the preparation of azo compounds**: Azo compounds are organic compounds that contain the functional group -N=N-.

### Step 2: Evaluate the options
1. **H2O2 (Hydrogen peroxide)**:
- It is a strong oxidizing agent but is not orange-colored; it is typically pale blue in pure form.
- **Conclusion**: Not the correct compound.

2. **KMnO4 (Potassium permanganate)**:
- It is a strong oxidizing agent but has dark purple crystals.
- **Conclusion**: Not the correct compound.

3. **Na2CrO4 (Sodium chromate)**:
- It is a strong oxidizing agent but has yellow-colored crystals.
- **Conclusion**: Not the correct compound.

4. **K2Cr2O7 (Potassium dichromate)**:
- It has bright orange-colored crystals.
- It is a strong oxidizing agent and is known to be used in various oxidation reactions, including the preparation of azo compounds.
- **Conclusion**: This is the correct compound.

### Final Answer:
The compound that is a strong oxidizing agent, has orange-colored crystals, and is used in the preparation of azo compounds is **Potassium dichromate (K2Cr2O7)**.

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