General Principles of Metallurgy - Competitive Exam Level
Q. Which of the following compounds is a Lewis acid?
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A.
NH3
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B.
BF3
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C.
H2O
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D.
NaCl
Solution
Boron trifluoride (BF3) is a Lewis acid because it can accept an electron pair.
Correct Answer: B — BF3
Q. Which of the following metals is extracted using the Hall-Héroult process?
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A.
Iron
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B.
Aluminum
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C.
Copper
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D.
Zinc
Solution
The Hall-Héroult process is used for the electrolytic reduction of aluminum oxide to produce aluminum.
Correct Answer: B — Aluminum
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