In the petroleum industry,what does a refinery do?
A) It separates crude oil into fractions consisting of compounds with similar boiling points.
B) It separates crude oil from the coal with which it is almost always found.
C) It mixes natural gas or coal with crude oil in order to remove the impurities from the crude oil.
D) It produces the machinery by which crude oil is removed from the grounD.
Correct Answer:
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Q28: Which is an advantage of using coal
Q29: According to the graph below, 
Q30: Petroleum (crude oil)is a complex mixture of
Q31: According to the graph below,
Q32: Which factor did not play a major
Q34: Soft lignite (brown coal)is the lowest grade
Q35: Which is a fossil fuel?
A)wood
B)uranium
C)ethanol
D)natural gas
Q36: The process by which a solution is
Q37: The diagram below shows a simplified version
Q38: According to the graph below,
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