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10 Oct 2019, 22:58
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Difficulty:
45%
(medium)
Question Stats:
74% (01:33) correct
26%
(01:44)
wrong
based on 23
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Eight percent of the Earth's crust is aluminum, and there are hundreds of aluminum-bearing minerals and vast quantities of the rocks that contain them. The best aluminum ore is bauxite, defined as aggregates of aluminous minerals, more or less impure, in which aluminum is present as hydrated oxides. Bauxite is the richest of all those aluminous rocks that occur in large quantities, and it yields alumina, the intermediate product required for the production of aluminum. Alumina also occurs naturally as the mineral corundum, but corundum is not found in large deposits of high purity, and therefore it is an impractical source for making aluminum. Most of the many abundant nonbauxite aluminous minerals are silicates, and, like all silicate minerals, they are refractory, resistant to analysis, and extremely difficult to process. The aluminum silicates are therefore generally unsuitable alternatives to bauxite because considerably more energy is required to extract alumina from them.
The passage supplies information for answering all of the following questions regarding aluminous minerals EXCEPT:
(A) What percentage of the aluminum in the Earth's crust is in the form of bauxite?
(B) Are aluminum-bearing nonbauxite minerals plentiful?
(C) Do the aluminous minerals found in bauxite contain hydrated oxides?
(D) Are aluminous hydrated oxides found in rocks?
(E) Do large quantities of bauxite exist?
The passage supplies information for answering all of the following questions regarding aluminous minerals EXCEPT:
(A) What percentage of the aluminum in the Earth's crust is in the form of bauxite?
(B) Are aluminum-bearing nonbauxite minerals plentiful?
(C) Do the aluminous minerals found in bauxite contain hydrated oxides?
(D) Are aluminous hydrated oxides found in rocks?
(E) Do large quantities of bauxite exist?
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10 Oct 2019, 22:59
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Bunuel
Try similar questions on the same stem:
https://gmatclub.com/forum/the-author-i ... 07805.html
https://gmatclub.com/forum/eight-percen ... 07807.html
17 Oct 2019, 05:05
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"Eight percent of the Earth's crust is aluminum,
and there are hundreds of aluminum-bearing minerals and vast quantities of the rocks that contain them"
The author mentions the percentage of aluminium.
"The best aluminum ore is bauxite"
Also he says the best ore is bauxite.
But we dont know the percentage of bauxite present in the earth
and there are hundreds of aluminum-bearing minerals and vast quantities of the rocks that contain them"
The author mentions the percentage of aluminium.
"The best aluminum ore is bauxite"
Also he says the best ore is bauxite.
But we dont know the percentage of bauxite present in the earth
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Critical Reasoning (CR) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
