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Cars fueled by methanol have a much lower level of emissions

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Cars fueled by methanol have a much lower level of emissions  [#permalink]

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New post 18 Oct 2019, 13:51
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A
B
C
D
E

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  35% (medium)

Question Stats:

73% (01:52) correct 27% (02:00) wrong based on 78 sessions

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Which of the following, if true, provides the most logical completion of the passage below?

Cars fueled by methanol have a much lower level of emissions of pollutants such as carbon monoxide and environmentally harmful hydrocarbons than gasoline-fueled cars do. Methanol fuel does produce somewhat higher formaldehyde emissions than gasoline does. Nevertheless, a methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car, because _______.

(A) compared to carbon monoxide and some hydrocarbons produced by gasoline-powered cars, formaldehyde pollution is not a serious threat to the environment
(B) the technical difficulties involved in mass-producing methanol-powered cars will prevent them from seriously competing with gasoline-powered cars for several years
(C) gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of many pollutants
(D) measuring a car's emissions is generally an accurate method of assessing that car's contribution to atmospheric pollution
(E) most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere


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Re: Cars fueled by methanol have a much lower level of emissions  [#permalink]

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New post 18 Oct 2019, 14:11
Hi,

Can anyone please explain why the answer is E and not C?
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Re: Cars fueled by methanol have a much lower level of emissions  [#permalink]

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New post 19 Oct 2019, 12:50
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We need a reason about the inner process, on why methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car

(C) gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of manypollutants

C says nothing about the process above

(E) most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere

I hope now is more clear to you.

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Re: Cars fueled by methanol have a much lower level of emissions  [#permalink]

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New post 19 Oct 2019, 23:39
carcass wrote:
Which of the following, if true, provides the most logical completion of the passage below?

Cars fueled by methanol have a much lower level of emissions of pollutants such as carbon monoxide and environmentally harmful hydrocarbons than gasoline-fueled cars do. Methanol fuel does produce somewhat higher formaldehyde emissions than gasoline does. Nevertheless, a methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car, because _______.

(A) compared to carbon monoxide and some hydrocarbons produced by gasoline-powered cars, formaldehyde pollution is not a serious threat to the environment
(B) the technical difficulties involved in mass-producing methanol-powered cars will prevent them from seriously competing with gasoline-powered cars for several years
(C) gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of many pollutants
(D) measuring a car's emissions is generally an accurate method of assessing that car's contribution to atmospheric pollution
(E) most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere


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The conclusion of this agreement in the last sentence focuses on "methanol-powered car actually produces less atmospheric formaldehyde pollution", therefore we need to focus only on the atmospheric formaldehyde pollution by the Gasoline based cars. Any option that is not speaking about this atmospheric formaldehyde pollution can be eliminated.

A: Talks about the threat of "carbon monoxide and some hydrocarbons produced by gasoline-powered cars". So can be eliminated
B: We are speaking about pollution per car and not the overall amount of pollution caused by all the cars. So incorrect
C: Not speaking about "atmospheric formaldehyde pollution". So can be eliminated
D: Out of scope since measurement is not talked of in the problem
E: Correct since this explains why Gasoline cars produce more atmospheric formaldehyde pollution despite producing less formaldehyde than Methanol based cars

So IMO E is the correct answer
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Cars fueled by methanol have a much lower level of emissions  [#permalink]

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New post 20 Oct 2019, 22:06
carcass wrote:
Which of the following, if true, provides the most logical completion of the passage below?

Cars fueled by methanol have a much lower level of emissions of pollutants such as carbon monoxide and environmentally harmful hydrocarbons than gasoline-fueled cars do. Methanol fuel does produce somewhat higher formaldehyde emissions than gasoline does. Nevertheless, a methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car, because _______.

(A) compared to carbon monoxide and some hydrocarbons produced by gasoline-powered cars, formaldehyde pollution is not a serious threat to the environment
(B) the technical difficulties involved in mass-producing methanol-powered cars will prevent them from seriously competing with gasoline-powered cars for several years
(C) gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of many pollutants
(D) measuring a car's emissions is generally an accurate method of assessing that car's contribution to atmospheric pollution
(E) most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere


Kudos for the right answer and explanation
Kudo for the author of the post.


For Methanol Powered Cars-higher formaldehyde emissions than but less atmospheric formaldehyde pollution
For Gasoline Powered Cars- lower formaldehyde emissions than but higher atmospheric formaldehyde pollution
Here we need a reason to Resolve this paradox
Choice E perfectly resolves this paradox by stating that though the formaldehyde emission is less in case of Gasoline powered cars, the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere is actually the cause of higher formaldehyde pollution.
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Cars fueled by methanol have a much lower level of emissions   [#permalink] 20 Oct 2019, 22:06
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