Which of the Following Statements Regarding the Hall-Heroult Process Is

question 98

Multiple Choice

Which of the following statements regarding the Hall-Heroult process is NOT correct?

• A)The production of aluminum from aluminum oxide is exothermic.
• B)Electric current is used to reduce Al³⁺ ions to Al metal.
• C)The principle energy cost of the Hall-Heroult process is the electricity needed to convert aluminum ions to aluminum metal.
• D)The major cost in recycling aluminum is the energy required to melt Al metal.
• E)The enthalpy of reaction for the production of molten Al from Al₂O₃ under the conditions used in the Hall-Heroult process is about 20 times larger (in magnitude)than the energy required to heat and melt Al metal.

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