The lowest grade of coal is
A) anthracite.
B) bituminous.
C) lignite.
D) peat.
Correct Answer:
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Q54: When coal is heated in the absence
Q55: When coal containing sulfur is burned,the sulfur
Q56: Which of the following did NOT contribute
Q57: When coal burns,
A)chemical energy is converted to
Q58: The major component of natural gas is
A)ethane.
B)methane.
C)butane.
D)octane.
Q60: Approximately what percentage of U.S.electricity is generated
Q61: Natural gas burns with a relatively clean
Q62: To make crude petroleum more useful,it must
Q63: Pure heptane would have an octane rating
Q64: The main components of petroleum are
A)hydrocarbons.
B)carbohydrates.
C)fats and
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