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# Until scientists invented the artificial isotopes, carbon ex

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Director
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Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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Updated on: 23 Aug 2013, 21:52
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82% (00:58) correct 18% (01:08) wrong based on 123 sessions

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Until scientists invented the artificial isotopes, carbon existed in two forms - either in planar sheets of atoms, in which case it becomes a soft material and conducts electrical impulses, or three dimensional structure, which makes it the hardest known material and acts as an insulator.

a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts

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Originally posted by blueseas on 23 Aug 2013, 13:07.
Last edited by blueseas on 23 Aug 2013, 21:52, edited 1 time in total.
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 13:19
either in ..... it should be or in............ only B and C

C has same issue as A... it does not have correct antecendent.. Carbon or Structure...
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 19:54
I would go with B.

B and C have the parallelism of "in" . In C it is not clear what "it" is - structure or carbon or what have you.
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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Updated on: 23 Aug 2013, 21:53
+1 for C...as either in X or in Y is idiomatic
either in x, in which case...or in Y, in wioich case.

Whats thats the OA?

Last edited by adityapagadala on 23 Aug 2013, 21:53, edited 1 time in total.
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 21:51
1
Until scientists invented the artificial isotopes, carbon existed in two forms - either in planar sheets of atoms, in which case it becomes a soft material and conducts electrical impulses, or three dimensional structure, which makes it the hardest known material and acts as an insulator.
Correct comparison structure is Either X or Y, wherein X & Y must be grammatically as well as logically parallel

a) three dimensional structure, which makes it the hardest known material and acts
X & Y are not parallel because X = IN planar sheets of atoms; whereas Y = three dimensional structure without any preposition. Moreover use of WHICH distorts the meaning because "WHICH ACTS" means that the Structure is acting as an insulator rather than Carbon itself. Thus Incorrect

b) in three dimensional structure, which makes carbon the hardest known material and acts
Use of WHICH distorts the meaning because "WHICH ACTS" means that the Structure is acting as an insulator rather than Carbon itself. Thus Incorrect

c) in three dimensional structure, in which case it becomes the hardest known material and acts
CORRECT

d) three dimensional structure, making it the hardest known material and acting
X & Y are not parallel because X = IN planar sheets of atoms; whereas Y = three dimensional structure without any preposition. Moreover use of ACTING distorts the meaning because "ACTING" means that the Structure is acting as an insulator rather than Carbon itself. Thus Incorrect

e) three dimensional structure and it becomes the hardest known material and acts
X & Y are not parallel because X = IN planar sheets of atoms; whereas Y = three dimensional structure without any preposition. Use of AND without any Comma creates a run-on sentence. Thus Incorrect
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 21:57
blueseas wrote:
Until scientists invented the artificial isotopes, carbon existed in two forms - either in planar sheets of atoms, in which case it becomes a soft material and conducts electrical impulses, or three dimensional structure, which makes it the hardest known material and acts as an insulator.

a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts

We have only 2 contenders : B and C
EITHER IN ...OR IN....==>parallel.

OPTION B is wrong because of the usage of WHICH....now WHICH in this case is refering to STRUCTURE ..but structure CANNOT make or act==>so this is wrong because meaning is illogical.

hence C wins.
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 22:02
blueseas wrote:
We have only 2 contenders : B and C
EITHER IN ...OR IN....==>parallel.

OPTION B is wrong because of the usage of WHICH....now WHICH in this case is refering to STRUCTURE ..but structure CANNOT make or act==>so this is wrong because meaning is illogical.

hence C wins.

Structure can make Carbon the hardest known material but structure can'tact as an Insulator.
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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23 Aug 2013, 22:06
fameatop wrote:
blueseas wrote:
We have only 2 contenders : B and C
EITHER IN ...OR IN....==>parallel.

OPTION B is wrong because of the usage of WHICH....now WHICH in this case is refering to STRUCTURE ..but structure CANNOT make or act==>so this is wrong because meaning is illogical.

hence C wins.

Structure can make Carbon the hardest known material but structure can'tact as an Insulator.

no fameatop..

This is incorrect because three dimensional structure does not make carbon the hardest known material. It is the fact that carbon exists in three dimensional structure that makes carbon the hardest known material.

regards
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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24 Aug 2013, 00:54
can someone clarify what it refers to in answer choice C ?

Until scientists invented the artificial isotopes, carbon(Singular) existed in two forms - either in planar sheets of atoms(plural), in which case it(Singular) becomes a soft material and conducts electrical impulses, or three dimensional structure(Singular), which makes it (Singular) the hardest known material and acts as an insulator.

a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts
Director
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Location: India
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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24 Aug 2013, 01:04
bhisma wrote:
can someone clarify what it refers to in answer choice C ?

Until scientists invented the artificial isotopes, carbon(Singular) existed in two forms - either in planar sheets of atoms(plural), in which case it(Singular) becomes a soft material and conducts electrical impulses, or three dimensional structure(Singular), which makes it (Singular) the hardest known material and acts as an insulator.

a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts

both IT are referring to CARBON.
if you think that pronoun IT is ambiguous in this sentence ..then just try to replace both the singular nouns ..and check which makes sense..
PRONOUN rule is not a definite rule and many a times accepted in GMAC questions.
please refer below article too to understand that in which all cases pronoun ambiguity is acceptable in GMAT
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Re: Until scientists invented the artificial isotopes, carbon ex  [#permalink]

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31 Jul 2017, 11:57
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Re: Until scientists invented the artificial isotopes, carbon ex   [#permalink] 31 Jul 2017, 11:57
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