alleryThe main commercial source of helium is:
ALiquid air
BCoal seams
CNatural gas
DSea water
Answer & Solution
Correct answer: C. Natural gas
1. Helium is found in minerals of radioactive origin.
2. Commercially it is drawn from a different source.
3. That source is natural gas.
_Source: syllabus Chemistry, Chapter 7, The p-Block Elements._
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