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19 Sep 2017, 07:22
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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:
45%
(medium)
Question Stats:
54% (01:08) correct
46%
(01:20)
wrong
based on 241
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Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water, by its foaming action caused by the release of nascent oxygen.
A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
20 Sep 2017, 09:50
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Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water, by its foaming action caused by the release of nascent oxygen.
we are comparing HYDROGEN PEROXIDE to heavy water hence heavy water should immediately follow than.
Since we are comparing and have more in the sentence we need than. This principle eliminate A,B and E
A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
Since we are comparing and have more in the sentence we need than.
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
Since we are comparing and have more in the sentence we need than.
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
Correct choice.
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
There is no main verb in the sentence. Hence a run on.
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
Since we are comparing and have more in the sentence we need than.
we are comparing HYDROGEN PEROXIDE to heavy water hence heavy water should immediately follow than.
Since we are comparing and have more in the sentence we need than. This principle eliminate A,B and E
A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
Since we are comparing and have more in the sentence we need than.
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
Since we are comparing and have more in the sentence we need than.
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
Correct choice.
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
There is no main verb in the sentence. Hence a run on.
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
Since we are comparing and have more in the sentence we need than.
20 Sep 2017, 10:27
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rohan2345
Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water, by its foaming action caused by the release of nascent oxygen.
A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
Dear rohan2345, A. Hydrogen peroxide is more efficient at disinfecting bacteria than is heavy water
B. Hydrogen peroxide is most efficient at disinfecting bacteria than is heavy water
C. Hydrogen peroxide is more efficient than heavy water at disinfecting bacteria
D. Hydrogen peroxide, more efficient than heavy water at disinfecting bacteria
E. Hydrogen peroxide disinfects bacteria more efficiently than heavy water
I'm happy to respond.
I don't have a high opinion of this question.
I find (A) and (C) essentially identical in terms of their acceptability. It is absolutely beyond me why the author thinks (A) is wrong and (C) is right. Choice (B) has a not-very-GMAT-like mistake, the use of "most" with "than." The missing-verb mistake in (D) is GMAT like. I actually think (E) has the most potential--if we changed this to "than does heavy water," it would be by far the strongest answer; even as it stands, I don't think we can justify rejecting (E) to choose (C). The entire phrasing of the sentence is less than optimal---presumably, we are not "disinfecting bacteria," that is, making sure all the bacteria are clean and healthy; instead, I imagine the topic should be "killing bacteria" or "disinfecting [part of the human body]." Finally, in the real world, hydrogen peroxide is something anyone can buy in a drug store and use as a disinfectant, where as heavy water (deuterium oxide) is a substance one would have only if one were operating some kind of nuclear program. I am not aware of any circumstances in which deuterium oxide is used as an ordinary disinfectant. I think the author wanted to toss around scientific sounding words without understanding them.
This is an abysmal question. Here's a high quality SC practice question:
Although more expensive
Does all this make sense?
Mike
