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Although fullerenes--spherical molecules made entirely of

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Although fullerenes--spherical molecules made entirely of [#permalink]

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New post 21 Jul 2009, 23:53
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Although fullerenes--spherical molecules made entirely of carbon--were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite. Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressue, this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these naturally occurring fullerenes were formed.

Which of the following, if true, most seriously undermines the argument?

A) Confirming that the shungite genuinely contained fullerenes took careful experimentation.
B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
C) The mineral shungite itself contains large amounts of carbon, from which the fullerenes apparently formed.
D) The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.
E) Shungite itself is formed only under distinctive conditions.

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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 00:09
IMO B

---
(2:20)
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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 00:19
sudeep wrote:
IMO B

---
(2:20)



That's what I thought as well, but it says the answer is D. It is a problem in the GMATPrep software, so they are likely correct.

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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 01:37
uzonwagba wrote:
sudeep wrote:
IMO B

---
(2:20)



That's what I thought as well, but it says the answer is D. It is a problem in the GMATPrep software, so they are likely correct.



well wrong again :(

Need to be more focused!!
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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 02:16
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This is a tricky one. Probably I would have also chosen B, but after knowing the answer I tried to evaluate all the options. Here is my opinion.

A) Confirming that the shungite genuinely contained fullerenes took careful experimentation. - Irrelevant, argument already says the experimentation was done before discovery of shungite
B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft. -Irrelevant, argument just talking about fullerenes in the mineral shungite, based on which geologists are going to do some analysis. Geologists may not be concerned about fullerenes found in other sources, if they can complete their analysis based on mineral shungite.
C) The mineral shungite itself contains large amounts of carbon, from which the fullerenes apparently formed. -Strengthens the argument
D) The naturally occurring fullerenes are arranged in a previously unknown crystalline structure. -Correct. The naturally occurring fullerenes are found in a formation different from that found in labs. So the natural one must have been developed under different circumstances, may not be similar to that in the lab.
E) Shungite itself is formed only under distinctive conditions. -Irrelevant, we are just concerned about fullerenes found in the mineral shungite, not about the mineral itself
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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 02:27
The argument says that Fullerenes are very rare and found in laboratory. And they are found in the rare mineral called shungite. Now, since lab synthesis of fullerenes requires specific temperature and pressure, we can find out about the state of earth's crust.
now, in my opinion, we can undermine it in two ways,
We can say that fullerenes occur naturally.
Secondly, we can say that fullerenes have come from outside and they are not found in earth.

So out of B &D, D undermines it more by saying that it is the same fullerenes, but its arrangement is different. and for its making, it does not require specific temperature and pressure.
So, D weakens it more strongly than B.



uzonwagba wrote:
Although fullerenes--spherical molecules made entirely of carbon--were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite. Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressue, this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these naturally occurring fullerenes were formed.

Which of the following, if true, most seriously undermines the argument?

A) Confirming that the shungite genuinely contained fullerenes took careful experimentation.
B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
C) The mineral shungite itself contains large amounts of carbon, from which the fullerenes apparently formed.
D) The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.
E) Shungite itself is formed only under distinctive conditions.

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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 09:21
Well explained bigoyal, I was trying to read beyond the meteorite hitting the spacecraft basically its impact on earth, since these would undermine any consideration about "Earth's crust at the time these naturally occurring fullerenes were formed."

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Re: Please take a stab at this CR question! Anyone!! Thanks ;) [#permalink]

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New post 22 Jul 2009, 14:21
IMO D.

"state of the Earth's crust at the time these naturally occurring fullerenes were formed." - From this statement, if the fullerenes is not formed directly and synthesized from other structure then state of the Earth crust during the actual formation cannot be found exactly.

Let me know if my reasoning is wrong...

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Re: Please take a stab at this CR question! Anyone!! Thanks ;)   [#permalink] 22 Jul 2009, 14:21
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Although fullerenes--spherical molecules made entirely of

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