Question

Assertion : Primitive atmosphere was of reducing type
Reason : First hydrogen atoms combined with all oxygen

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

The interstellar dust from which earth originated was especially rich in hydrogen. It readily combined with nitrogen forming ammonia, with carbon forming methane, and with oxygen forming water leaving no free oxygen. Thus, early atmosphere of primitive earth was strongly reducing, it contained hydrogen, methane, ammonia and water vapours