It is currently 18 Jun 2019, 08:58

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# A worldwide ban on the production of certain ozone-destroyin

Author Message
TAGS:
Founder
Joined: 18 Apr 2015
Posts: 6898
Followers: 114

Kudos [?]: 1342 [0], given: 6309

A worldwide ban on the production of certain ozone-destroyin [#permalink]  13 Feb 2019, 06:20
Expert's post
00:00

Question Stats:

70% (00:53) correct 30% (01:32) wrong based on 10 sessions
A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of refrigerators. When they reach the ozone layer in the atmosphere, their action cannot be halted. So there is no way to prevent these chemicals from damaging the ozone layer further.

Which of the following, if true, most seriously weakens the argument above?

(A) It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
(B) In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
(C) Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
(D) Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
(E) The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused
[Reveal] Spoiler: OA

_________________
Manager
Joined: 04 Feb 2019
Posts: 204
Followers: 4

Kudos [?]: 106 [0], given: 0

Re: A worldwide ban on the production of certain ozone-destroyin [#permalink]  24 Feb 2019, 21:03
Expert's post
(A) The prompt uses the very vague "quantities" to describe the amount of chemicals used in refrigerators. Is that a lot? A little? It doesn't matter. The conclusion is that however much of these chemicals there are, they'll reach the ozone layer. Accuracy in measurement, then, is irrelevant.

(B) Refrigeration is necessary, yes, but are these dangerous chemicals the only means of refrigeration? But this is again irrelevant, as the argument is about the chemicals already in use, and how they will damage the ozone layer.

(C) Once more, there are chemicals that exist right now, and these chemicals are going to damage the ozone layer. That's what the argument says, and it doesn't care at all about future chemicals.

(D) This is a strengthener, making essentially the same argument as the prompt itself. The current chemicals are dangerous.

(E) This is the best answer. If the chemicals are fully recycled over and over again until the end of time, then they will never be released into the atmosphere and damage the ozone layer.
Re: A worldwide ban on the production of certain ozone-destroyin   [#permalink] 24 Feb 2019, 21:03
Display posts from previous: Sort by