It is currently 17 Dec 2017, 13:51

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

V07-15

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42652

Kudos [?]: 135978 [0], given: 12719

V07-15 [#permalink]

Show Tags

New post 16 Sep 2014, 01:29
Expert's post
3
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

37% (01:40) correct 63% (01:45) wrong based on 87 sessions

HideShow timer Statistics

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 pressure, 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 undermine 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 shungnite itself contains large amount of carbon, from which fullerenes apparently formed
D. The naturally occurring fullerenes are arranged in a previously unknown crystalline structure
E. Shungite itself is only formed under distinctive conditions
[Reveal] Spoiler: OA

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135978 [0], given: 12719

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42652

Kudos [?]: 135978 [0], given: 12719

Re V07-15 [#permalink]

Show Tags

New post 16 Sep 2014, 01:29
Expert's post
1
This post was
BOOKMARKED
Official Solution:

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 pressure, 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 undermine 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 shungnite itself contains large amount of carbon, from which fullerenes apparently formed
D. The naturally occurring fullerenes are arranged in a previously unknown crystalline structure
E. Shungite itself is only formed under distinctive conditions


D undermines the argument by attacking the premise by suggesting that naturally occurring fullerene and synthetic fullerene differ in their structure. Since the objects of comparison are not similar, the comparison between the conditions these were formed does not stand.

A) the effort which took to confirm fullerene presence in shungite is irrelevant to the argument. What matters is whether shungite contains fullerene or not.

B) This one is close. I almost fell for it. It seems to offer an alternate explanation for the formation of fullerene. But what should be considered is, even if fullerene is formed in outer space does that change anything if it is also formed in earth? No, it does not.

C) This one provides more evidence to the argument and thus is strengthening the argument.

E) This is the premise itself.


Answer: D
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135978 [0], given: 12719

1 KUDOS received
Manager
Manager
avatar
Joined: 03 Apr 2014
Posts: 99

Kudos [?]: 6 [1], given: 19

Location: India
GMAT 1: 730 Q51 V37
GPA: 3
Reviews Badge
Re V07-15 [#permalink]

Show Tags

New post 01 Jan 2016, 23:00
1
This post received
KUDOS
I don't agree with the explanation. b is the right ans

Kudos [?]: 6 [1], given: 19

1 KUDOS received
Intern
Intern
avatar
S
Joined: 20 Mar 2016
Posts: 37

Kudos [?]: 2 [1], given: 156

GMAT 1: 530 Q33 V28
GMAT ToolKit User Premium Member
Re: V07-15 [#permalink]

Show Tags

New post 16 Jul 2016, 17:56
1
This post received
KUDOS
I did not choose answer D because of the words "previously unknown crystalline structure",does this mean that this structure is not known at present ?
Experts please explain ..

Thank you :)
_________________

Jat

Kudos [?]: 2 [1], given: 156

Expert Post
1 KUDOS received
Verbal Expert
User avatar
S
Joined: 14 Dec 2013
Posts: 3227

Kudos [?]: 3652 [1], given: 22

Location: Germany
Schools: HHL Leipzig
GMAT 1: 780 Q50 V47
WE: Corporate Finance (Pharmaceuticals and Biotech)
GMAT ToolKit User Premium Member Reviews Badge
V07-15 [#permalink]

Show Tags

New post 18 Jul 2016, 10:59
1
This post received
KUDOS
Expert's post
Jat wrote:
I did not choose answer D because of the words "previously unknown crystalline structure",does this mean that this structure is not known at present ?
Experts please explain ..

Thank you :)


This implies that the structure is known now, but it actually does not matter whether it is known now - the importatnt part is that, the structure of natural F was not known till it was discovered in nature.

First laboratory F (lab F) was synthesized - therefore the structure of lab F was already known before the discovery of natural F. Thereafter natural F (nat F) was discovered. Option D states that the crystalline structure of nat F is not previously known. This implies that the structure of nat F MUST be different from lab F. Hence the conditions at which both were created were not same. Hence laboratory conditions and earth conditions were not same. Hence laboratory synthesis of lab F cannot help in fidning out the condition of earth's crust during formation of natural F.

Kudos [?]: 3652 [1], given: 22

1 KUDOS received
Intern
Intern
avatar
B
Joined: 06 Aug 2015
Posts: 46

Kudos [?]: 19 [1], given: 63

Concentration: General Management, Entrepreneurship
GMAT Date: 10-30-2016
GPA: 3.34
WE: Programming (Consulting)
Reviews Badge
Re: V07-15 [#permalink]

Show Tags

New post 01 Sep 2016, 07:32
1
This post received
KUDOS
Very tricky one and good explanation.

Critical thinkers.

Kudos [?]: 19 [1], given: 63

Intern
Intern
avatar
Joined: 19 Jun 2016
Posts: 2

Kudos [?]: [0], given: 7

Re: V07-15 [#permalink]

Show Tags

New post 23 Feb 2017, 01:21
But how is it concluded that the one synthesized in lab is not crystalline? Please Explain.

Thanks!

Kudos [?]: [0], given: 7

Expert Post
2 KUDOS received
Verbal Expert
User avatar
S
Joined: 14 Dec 2013
Posts: 3227

Kudos [?]: 3652 [2], given: 22

Location: Germany
Schools: HHL Leipzig
GMAT 1: 780 Q50 V47
WE: Corporate Finance (Pharmaceuticals and Biotech)
GMAT ToolKit User Premium Member Reviews Badge
Re: V07-15 [#permalink]

Show Tags

New post 25 Feb 2017, 02:53
2
This post received
KUDOS
Expert's post
sonam1987 wrote:
But how is it concluded that the one synthesized in lab is not crystalline? Please Explain.

Thanks!


It has not been concluded that the one synthesized in lab is not crystalline. The basis of reasoning is that the structure was not known before - both could have crystalline structure, but different from each other.

Kudos [?]: 3652 [2], given: 22

Intern
Intern
avatar
Joined: 11 Nov 2016
Posts: 4

Kudos [?]: [0], given: 6

Re: V07-15 [#permalink]

Show Tags

New post 25 Mar 2017, 14:25
E. Shungite itself is only formed under distinctive conditions

My reasoning for E) is -
If Shugnite itself forms under distinctive conditions, then it would be tough for researchers to "evaluate the hypotheses about the state of the Earth's crust at the time these naturally occurring fullerenes were formed" since Shugnite and the F inside them could require different conditions. Conditions outside may not translate to the conditions inside the mineral. Researchers in this case would be looking for conditions required for F to validate their hypothesis but they would actually need to look for conditions required for the mineral.

Kudos [?]: [0], given: 6

2 KUDOS received
Manager
Manager
avatar
B
Joined: 23 Jan 2017
Posts: 74

Kudos [?]: 0 [2], given: 8

CAT Tests
Re: V07-15 [#permalink]

Show Tags

New post 22 Oct 2017, 11:53
2
This post received
KUDOS
I am not very convinced yet.

Let me talk about option D later. Let us first understand why B should be incorrect?

The argument says that Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure, 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.

Now, if it get known that this fullerenes came from some meteorite, than the argument definitely gets weakened, because now geologist will NOT be able to evaluate hypotheses about the state of the Earth's crust at the time these fullerenes were found (i.e. in meteor remains). So B IS a correct answer.

Now, looking at D: I am not a chemistry expert, but if the structure is different, wouldn't that make it a different substance/different compound altogether? Then it will not be called fullerene. e.g. coal and diamond have different structures of carbon. Because they have different structures, they have different properties. So they are different substances. With this understanding, option D seems to be invalid altogether. (My understanding about chemical structures may not be 100% correct though).

Please share your thoughts!!!

Kudos [?]: 0 [2], given: 8

Re: V07-15   [#permalink] 22 Oct 2017, 11:53
Display posts from previous: Sort by

V07-15

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: chetan2u, Bunuel



GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.