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Concerns for the environment have led chemists to develop plastics tha

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Concerns for the environment have led chemists to develop plastics tha  [#permalink]

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Concerns for the environment have led chemists to develop plastics that are degradable. All degradable plastics, which are potentially useful packaging materials, need just the right conditions to break down. Some need exposure to sunlight, some need to be buried in soil, and some need to be submerged in water. It should be cautioned that some degradable plastics leave residues of unknown toxicity.

If all of the statements above are true, which one of the following must also be true?

(A) Some materials that are potentially useful for packaging leave residues of unknown toxicity.

(B) Some degradable plastics need both sunlight and submersion in order to break down.

(C) Some materials that need sunlight in order to break down are not potentially useful packaging materials.

(D) Some materials that leave residues of unknown toxicity are not degradable plastics.

(E) Some materials that need to be buried in soil to break down leave residues of unknown toxicity.

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Originally posted by souvik101990 on 25 Sep 2014, 10:59.
Last edited by gmat1393 on 08 Jun 2019, 08:12, edited 2 times in total.
Renamed the topic and edited the question.
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Re: Concerns for the environment have led chemists to develop plastics tha  [#permalink]

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New post 29 Sep 2014, 10:57
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I did a brief analysis.

We must to have in mind that the correct question must always be true.

Concerns for the environment have led chemists to develop plastics that are degradable. All degradable plastics, which are potentially useful packaging materials, need just the right conditions to break down. Some need exposure to sunlight, some need to be buried in soil, and some need to be submerged in water. It should be cautioned that some degradable plastics leave residues of unknown toxicity. If all of the statements above are true, which one of the following must also be true?

(A) Some materials that are potentially useful for packaging leave residues of unknown toxicity.
It is always true, some means 1 or 100. The stimulus states: "It should be cautioned that some degradable plastics leave residues of unknown toxicity", and all degradable plastics are potentially useful packaging materials, thus it must be always true.

(B) Some degradable plastics need both sunlight and submersion in order to break down.
It is not true. "Some need exposure to sunlight, some need to be buried in soil, and some need to be submerged in water"

(C) Some materials that need sunlight in order to break down are not potentially useful packaging materials.
It not true, because some are potentially useful packaging materials "all degradable plastics are potentially useful packaging materials"

(D) Some materials that leave residues of unknown toxicity are not degradable plastics.
It could be true, but it also cannot be true

(E) Some materials that need to be buried in soil to break down leave residues of unknown toxicity.
It is pretty good contender, but I think it is not always true, because some material that need to be buried in soil could not always be degradable plastics, so it cannot be true with the information given.

Therefore, the correct answer should be A.
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Re: Concerns for the environment have led chemists to develop plastics tha  [#permalink]

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New post 24 May 2019, 07:55
souvik101990 wrote:
Concerns for the environment have led chemists to develop plastics that are degradable. All degradable plastics, which are potentially useful packaging materials, need just the right conditions to break down. Some need exposure to sunlight, some need to be buried in soil, and some need to be submerged in water. It should be cautioned that some degradable plastics leave residues of unknown toxicity.

If all of the statements above are true, which one of the following must also be true?


The final sentence is the key sentence that most of the answer choices are referring to.

souvik101990 wrote:
(A) Some materials that are potentially useful for packaging leave residues of unknown toxicity.


Absolutely. This is stated in sentence #2 and the final sentence.

souvik101990 wrote:
(B) Some degradable plastics need both sunlight and submersion in order to break down.


Not necessarily. We know that some need sunlight, some need to be buried, some need to be under water. We don't necessarily know that some need two of these conditions in order to break down.

souvik101990 wrote:
(C) Some materials that need sunlight in order to break down are not potentially useful packaging materials.


Out of scope. We know that all degradable plastics, which have potential to be useful packaging, need a certain action to occur in order for them to break down.

souvik101990 wrote:
(D) Some materials that leave residues of unknown toxicity are not degradable plastics.


Out of scope. We are only talking about degradable plastics here. There may or may not be other materials that leave toxic residues. Who knows? We sure won't make any assumptions, especially in a must be true question!

souvik101990 wrote:
(E) Some materials that need to be buried in soil to break down leave residues of unknown toxicity.


We only know that "some degradable plastics leave residues of unknown toxicity." And some of these degradable plastics require certain actions to be broken down. Yes, sunlight, burying in soil, and submerging in water are the 3 actions that we know that lead to certain plastics being broken down. But we don't know for sure that the ones require being buried in soil are the ones that leave toxic residues.
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Re: Concerns for the environment have led chemists to develop plastics tha   [#permalink] 24 May 2019, 07:55
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