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10 Oct 2019, 22:58
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
81% (01:57) correct
19%
(02:39)
wrong
based on 48
sessions
History
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Time
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Not Attempted Yet
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 author implies that corundum would be used to produce aluminum if
(A) corundum could be found that is not contaminated by silicates
(B) the production of alumina could be eliminated as an intermediate step in manufacturing aluminum
(C) many large deposits of very high quality corundum were to be discovered
(D) new technologies were to make it possible to convert corundum to a silicate
(E) manufacturers were to realize that the world's supply of bauxite is not unlimited
The author implies that corundum would be used to produce aluminum if
(A) corundum could be found that is not contaminated by silicates
(B) the production of alumina could be eliminated as an intermediate step in manufacturing aluminum
(C) many large deposits of very high quality corundum were to be discovered
(D) new technologies were to make it possible to convert corundum to a silicate
(E) manufacturers were to realize that the world's supply of bauxite is not unlimited
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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 ... 07806.html
https://gmatclub.com/forum/eight-percen ... 07807.html
17 Oct 2019, 05:09
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"corundum is not found in large deposits of high purity, and therefore it is an impractical source for making aluminum. "- The author mentioned.
Before checking the options we can analyse the reason that we not able to make aluminium out of corundum.
So in order to make aluminium there should be bauxite in large deposits of high purity.
It directly matches with option C.
Before checking the options we can analyse the reason that we not able to make aluminium out of corundum.
So in order to make aluminium there should be bauxite in large deposits of high purity.
It directly matches with option C.
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!
