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Sajjad1994
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Solution to Q2


2. Which one of the following, if true, would most strengthen the conclusions of Molina and Rowland concerning the long-term effects of CFCs in the stratosphere?

Q stem analysis -->
First take 5 seconds to reiterate the conclusion.
Both Molina and Rowland conclude that even after the CFC are banned, there's long term damage which continues for years if not decades.

Now we need to choose an option which STRENGTHENS this conclusion.

On more tip - the question says that we need to assumed each option to be TRUE. So tackle options accordingly. There is no denying validity of each option.

Let's look at the options

(A) The hole in the ozone layer over Antarctica continued to grow for years after CFC emissions had almost ceased.
Ok.. In line with conclusion. If this is true, we have an option that strengthens the conclusion based on what is observed (ie., hole in ozone continues growing)
However, let's not immediately mark this as correct. Eliminate the rest.


(B) Other manufactured chemicals have been found to diffuse upward into the stratosphere when released into the troposphere.
Incorrect. Ok but does not tell what happens once diffused. Does it harm Ozone for ex?


(C) Ozone has been shown to react more violently with chlorine than with many other chemicals.
Incorrect.. Does not talk about long term effects of CFC


(D) Many scientists who in the 1970s were highly critical of the research methods of Molina and Rowland have come to accept the soundness of their methods.
Incorrect. Same reason as C


(E) Current CFC levels in the troposphere suggest that not all nations currently abide by the Montreal Protocol.
Incorrect. This weakens. This says there is another reason to the conclusion as the Ozone is depleting NOT because of the Long term effect but due to OTHER chemicals.
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Solution to Q3

3. Which one of the following statements is most strongly supported by the information in the passage?

Q stem Analysis --> Same as Q1 - choose an option which MUST BE TRUE.


(A) Little or no ozone destruction occurs naturally in the stratosphere unless chlorine is present.
Incorrect. We cannot say CONCUSIVELY that chlorine MUST be present for depletion


(B) Skin cancers occur primarily because of excessive absorption of ultraviolet light.
Ok.. Passage does tell in the beginning. Let's keep this but the work PRIMARILY jumps at me. So will come back to this.


(C) Few chemicals besides CFCs can result in the release of chlorine in the upper atmosphere.
Incorrect.. We cannot tell about things outside CFC. Out of scope.


(D) Regulating the use of CFCs contributes indirectly to lowering the incidence of skin cancer.
Ok looks good.. The passage tells that regulating CFC will lead to Ozone NOT depleting which INDIRECTLY can lower skin cancer given it keeps UV lights out.


(E) The upward flow of CFCs into the stratosphere occurs mainly in Antarctica.
Incorrect. We cannot surely say it occurs ONLY in Antarctica.

Between B & D - I would reject B simply coz of the word 'primarily'

Hence D
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Please explain the reasoning for Q4’s option.

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Sajjad1994
Can you explain answer for question 5
I feel option D is right answer and it is stated in last few lines of Last paragraph.
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Can you please explain Q5.
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RahulJain293
Sajjad1994 Could you please help with Q4 & 5 solution?

Also, for Q4, Option C & D seems to be not printed well.. Or is it just me?

Kapil1650
Please explain the reasoning for Q4’s option.

Explanation

4. Based on the passage, the information yielded by which one of the following experiments would be most useful in determining whether a particular chemical could replace CFCs without damaging the ozone layer?

Difficulty Level: 700

Explanation

The question is asking for a test that would determine whether a chemical could avoid the harmful effects of CFCs. The passage states that the chlorine from CFCs has a devastating effect on the ozone layer.

A. No. Reactions with other forms of oxygen wouldn’t help determine effects on the ozone layer.

B. No. Reactions with other chemicals wouldn’t help determine effects on the ozone layer.

C. No. A reaction with chlorine would not be relevant because there isn’t chlorine in the ozone layer.

D. Yes. Since chlorine has a devastating effect on the ozone layer, determining similarities with chlorine would be useful to determine whether a chemical might damage the ozone layer.

E. No. It is not the fact that CFCs break down into components that is the problem, but rather that one of the components is chlorine, which damages the ozone layer.

Answer: D
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RahulJain293
Sajjad1994 Could you please help with Q4 & 5 solution?

Also, for Q4, Option C & D seems to be not printed well.. Or is it just me?

parsh008
Can you please explain Q5.

Vishal_Jain
Sajjad1994
Can you explain answer for question 5
I feel option D is right answer and it is stated in last few lines of Last paragraph.

Explanation

5. Which one of the following statements is most strongly supported by the information in the passage?

Difficulty Level: 700+

Explanation

The correct answer will be the statement best supported by evidence in the passage.

A. No. This answer choice is extreme and unsupported. The passage does not discuss whether alternative chemicals were available.

B. Yes. The passage states at the end of the fourth paragraph that the banning of CFCs has led to the development of more environmentally friendly refrigerant chemicals.

C. No. This answer choice is extreme and unsupported. The passage does not discuss the energy efficiency of CFCs.

D. No. The passage states that CFCs were banned in North America approximately a decade prior to the Montreal Protocol.

E. No. The passage only states that the banning of CFCs has led to the development of more environmentally friendly refrigerant chemicals.

Answer: B
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@GMATNinja @MartyTargetTestPrep Could you please provide an explanation for Q5?
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bv8562
@GMATNinja @MartyTargetTestPrep Could you please provide an explanation for Q5?

You may like this one.

https://gmatclub.com/forum/by-1970-it-w ... l#p3224139

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