Multiple Choice
What is the principal source of commercial helium?
A) Certain natural gas wells.
B) Fractional distillation of air.
C) It is a byproduct of commercial fusion research.
D) It is a byproduct of commercial fission reactors.
E) The mineral cleveite,a uranium ore.
Correct Answer:

Verified
Correct Answer:
Verified
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Q16: Which one of the following metals reacts
Q17: Which of the following compounds is a
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Q20: Which of the following is the acid
Q21: The commercial method of isolating magnesium from
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