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When permits for the discharge of chemicals into a waterway

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When permits for the discharge of chemicals into a waterway [#permalink] New post 07 Jan 2004, 12:16
00:00
A
B
C
D
E

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(N/A)

Question Stats:

100% (01:03) correct 0% (00:00) wrong based on 2 sessions
19. When permits for the discharge of chemicals into a waterway are issued, they are issued in terms of the number of pounds each chemical that can be discharged into the waterway per day. These figures, calculated separately for each chemical for which a permit is issued, are based on an estimate of the effect of the dilution of the chemical by the amount of water flowing through the waterway. The waterway is therefore protected against being adversely affected by chemicals discharged under the permits.

The argument depends on the assumption that

(A) relatively harmless chemicals do not interact with each other in the water to form harmful compounds

(B) there is a swift flow of water in the waterway that ensures rapid dispersion of chemicals discharged

(C) those who receive the permits do not always discharge the entire quantity of chemicals that the permits allow

(D) the danger of chemical pollution of waterways is to be evaluated in terms of human health only and not in terms of the health of both human beings and wildlife
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 [#permalink] New post 07 Jan 2004, 14:03
I am also getting A by process of elimination.
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Re: CR - Water Pollution [#permalink] New post 07 Jan 2004, 14:10
anandnk wrote:
19. When permits for the discharge of chemicals into a waterway are issued, they are issued in terms of the number of pounds each chemical that can be discharged into the waterway per day. These figures, calculated separately for each chemical for which a permit is issued, are based on an estimate of the effect of the dilution of the chemical by the amount of water flowing through the waterway. The waterway is therefore protected against being adversely affected by chemicals discharged under the permits.

The argument depends on the assumption that

(A) relatively harmless chemicals do not interact with each other in the water to form harmful compounds

(B) there is a swift flow of water in the waterway that ensures rapid dispersion of chemicals discharged

(C) those who receive the permits do not always discharge the entire quantity of chemicals that the permits allow

(D) the danger of chemical pollution of waterways is to be evaluated in terms of human health only and not in terms of the health of both human beings and wildlife


I get A

B was tempting but it was already stated in the passage so it is not an assumption.
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 [#permalink] New post 07 Jan 2004, 16:44
Agree with the group ...A

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 [#permalink] New post 08 Jan 2004, 06:15
Refute B please

As per the argument the pollution is kept under control by limiting the discharge to such an amount that it is diluted to an harmless extent. The question does not ask for weakening or strengthening. If the chemical is not diluted then it is not serving the purpose. This has to be the assumption to connect the conclusion and premise.
A is out of scope though it would sound logical for a question "which one of the following if true would weaken authors argument"

B tells that whatever the authorities expect is indeed happening.
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 [#permalink] New post 08 Jan 2004, 06:54
anandnk wrote:
Refute B please

As per the argument the pollution is kept under control by limiting the discharge to such an amount that it is diluted to an harmless extent. The question does not ask for weakening or strengthening. If the chemical is not diluted then it is not serving the purpose. This has to be the assumption to connect the conclusion and premise.
A is out of scope though it would sound logical for a question "which one of the following if true would weaken authors argument"

B tells that whatever the authorities expect is indeed happening.


The best way to find out an assumption is to negate it.

Lets negate B.
We get -
The flow of water is not enough to "disperse" the chemicals.

But the important point to note is that the argument is based on "dilution" not "dispersion". A chemical can be diluted in stagnant water. Can't it ?
So, even if you negate Option B the argument still stands.

Now, lets negate A.
We get -
The chemicals interact with each other and create other harmful chemicals.

Even if there is flow of water, or even if the chemicals are diluted, if the chemicals can potentially interact to form harmful compounds then the argument falls apart. Doesn't it ?
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 [#permalink] New post 08 Jan 2004, 07:07
:bang:
You are right. I confused dispersion with dilution.
A is correct.
  [#permalink] 08 Jan 2004, 07:07
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When permits for the discharge of chemicals into a waterway

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