The most important compound of hydrogen on Earth is
AMethane, the natural gas in the air
BWater, covering about 70% of the surface
CAmmonia, the fertilizer feedstock
DSulphuric acid, the king of chemicals
Answer & Solution
Correct answer: B. Water, covering about 70% of the surface
1. The chapter says hydrogen is mostly in combined form on Earth.
2. The chapter calls water the most important hydrogen compound.
3. Water covers about 70% of the Earth's surface.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on occurrence_
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