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Stanley Lloyd Miller a graduate student ...

Stanley Lloyd Miller a graduate student of Harold C. Urey, Conducted an experiment to demonstrate that simple organic molecules like amino acids could be produced if an electric discharge is passed through a mixture of such gases as might have been present in the atmosphere of the early earth. The gaseous mixture used in the experiment comprised

A

methane, ammonia, hydrogen, water vapour

B

methane,carbon dioxide,nitrogen,water vapour

C

ammonia,carbon dioxide,nitrogen water vapour

D

methane,ammonia,nitrogen,water vapour

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**Step-by-Step Solution:** 1. **Understanding the Experiment**: The Miller-Urey experiment was designed to test the chemical origins of life on early Earth. The goal was to see if simple organic molecules could be formed from inorganic compounds under conditions similar to those of the early Earth. 2. **Identifying the Gases Used**: The experiment involved passing an electric discharge through a mixture of gases that were believed to be present in the early Earth's atmosphere. The gases used in the experiment were: - Methane (CH₄) - Ammonia (NH₃) - Hydrogen (H₂) - Water vapor (H₂O) 3. **Analyzing the Options**: The question provides several options for the gaseous mixture. We need to identify the correct combination based on the gases used in the Miller-Urey experiment. - Option A: Methane, Ammonia, Hydrogen, Water vapor - Option B: Methane, Carbon dioxide, Nitrogen, Water vapor - Option C: Ammonia, Carbon dioxide, Nitrogen, Water vapor - Option D: Methane, Ammonia, Nitrogen, Water vapor 4. **Evaluating Each Option**: - **Option A**: Methane, Ammonia, Hydrogen, Water vapor - This matches the gases used in the experiment. - **Option B**: Methane, Carbon dioxide, Nitrogen, Water vapor - Incorrect because carbon dioxide and nitrogen were not part of the original mixture. - **Option C**: Ammonia, Carbon dioxide, Nitrogen, Water vapor - Incorrect for the same reason as Option B. - **Option D**: Methane, Ammonia, Nitrogen, Water vapor - Incorrect because nitrogen was not included in the original mixture. 5. **Conclusion**: The correct gaseous mixture used in the Miller-Urey experiment is found in Option A: Methane, Ammonia, Hydrogen, Water vapor. **Final Answer**: Option A: Methane, Ammonia, Hydrogen, Water vapor. ---
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