Which of the following was used as an energy source by Miller in his experiment?

Options

A. Methane , ammonia , hydrogen and carbon monoxide .
B. Ammonia , water carbon dioxide and oxygen .
C. Methane , water , oxides of nitrogen and oxygen .
D. Methane , ammonia , hydrogen and water vapour .

Answer

To solve the question regarding which energy source was used by Miller in his experiment, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Miller's Experiment**: In 1952, Stanley Miller conducted an experiment to simulate the conditions of early Earth. The goal was to see if organic compounds could be formed from inorganic precursors.

2. **Identifying the Gaseous Mixture**: Miller used a specific combination of gases in his experiment. The gases he used included methane (CH₄), ammonia (NH₃), hydrogen (H₂), and water vapor (H₂O).

3. **Energy Source in the Experiment**: Miller introduced an energy source into the system to drive chemical reactions. He used electric sparks to simulate lightning, which would have been a source of energy on the early Earth.

4. **Evaluating the Options**: The options provided in the question are:
- Methane, Ammonia, Hydrogen and Carbon Monoxide
- Ammonia, Water, Carbon Dioxide and Oxygen
- Methane, Water, Oxides of Nitrogen and Oxygen
- Methane, Ammonia, Hydrogen and Water Vapor

Among these, the correct combination of gases used by Miller is the last option: **Methane, Ammonia, Hydrogen, and Water Vapor**.

5. **Conclusion**: The correct answer to the question is that Miller used **Methane, Ammonia, Hydrogen, and Water Vapor** as the gaseous mixture in his experiment.