Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 15 PCB Single Correct MCQ
Published on: August 13, 2026

Which of the following environmental conditions on primitive Earth was most essential for facilitating the abiotic synthesis of organic molecules, as proposed in the theory of chemical evolution?

A
High atmospheric oxygen concentration promoting oxidative polymerization.
B
Extremely low temperature and lack of high-energy input for molecular activation.
C
Stable geological environment with absence of volcanic activity.
D
A reducing atmosphere rich in methane, ammonia, and hydrogen enabling prebiotic synthesis.

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The correct answer is:
D

The reducing atmosphere on early Earth, containing methane ( ), ammonia , and hydrogen , along with volcanic activity and high temperatures, was essential for the chemical evolution of organic molecules.

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