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Although the suspected carcinogen dioxin is formed when lignin......

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Director
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Although the suspected carcinogen dioxin is formed when lignin......  [#permalink]

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New post 10 Mar 2019, 10:41
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A
B
C
D
E

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  25% (medium)

Question Stats:

87% (01:44) correct 13% (02:51) wrong based on 47 sessions

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Although the suspected carcinogen dioxin is formed when lignin, found in paper, and chlorine, found in plastic, come together in an incinerator, advocates of garbage disposal through burning maintain that separating garbage is impractical and unnecessary. They claim that high-temperature incineration will destroy the ingredients needed for production of dioxin.

Which of the following, if true, is most damaging to the advocates' argument above?

A) Sorting garbage would allow recovery of recyclable materials as well as prevent dioxin formation.
B) Incineration of plastics is suspected of causing emissions of several dangerous pollutants.
C) The level at which dioxin concentrations become unacceptably high is still a matter of dispute within the scientific community.
D) Existing incineration technology leaves residues containing sufficient amounts of lignin and chlorine for dioxin formation after burning.
E) Lignin and chlorine are found in other substances that might be burned in a garbage-disposal plant as well as paper and plastic.

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Re: Although the suspected carcinogen dioxin is formed when lignin......  [#permalink]

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New post 10 Mar 2019, 10:47
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IMO D because it gives us a reason to believe that existing technologies are not efficient enough to avoid formation of dioxin even after burning the garbage as some residues are left out and these residues are sufficient to allow the formation of dioxin.

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Re: Although the suspected carcinogen dioxin is formed when lignin......  [#permalink]

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New post 10 Mar 2019, 15:01
CAMANISHPARMAR wrote:
Although the suspected carcinogen dioxin is formed when lignin, found in paper, and chlorine, found in plastic, come together in an incinerator, advocates of garbage disposal through burning maintain that separating garbage is impractical and unnecessary. They claim that high-temperature incineration will destroy the ingredients needed for production of dioxin.

Which of the following, if true, is most damaging to the advocates' argument above?

A) Sorting garbage would allow recovery of recyclable materials as well as prevent dioxin formation.
B) Incineration of plastics is suspected of causing emissions of several dangerous pollutants.
C) The level at which dioxin concentrations become unacceptably high is still a matter of dispute within the scientific community.
D) Existing incineration technology leaves residues containing sufficient amounts of lignin and chlorine for dioxin formation after burning.
E) Lignin and chlorine are found in other substances that might be burned in a garbage-disposal plant as well as paper and plastic.





This is a weaken question and what we need to find is an answer that weakens the burning method of garbage disposal. Clearly, it is D.
A: Provides support to the other method of disposal but clearly fails to weaken the burning method. - OUT
B: Maybe universally true but does not have any connection to the question stem. - OUT
C: Immaterial, Irrelevant. - OUT
D: Tells us why burning is not efficient as the method if adopted will still contain residues which weakens the conclusion: Correct
E: Doesn't make any sense, we know it from the question stem already.
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Re: Although the suspected carcinogen dioxin is formed when lignin......   [#permalink] 10 Mar 2019, 15:01
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Although the suspected carcinogen dioxin is formed when lignin......

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