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Often visible as smog, ozone is formed in the atmosphere [#permalink]
 18 Mar 2011, 01:18
Question Stats:
86% (01:33) correct
13% (00:44) wrong based on 5 sessions
Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight. (A) ozone is formed in the atmosphere from (B) ozone is formed in the atmosphere when (C) ozone is formed in the atmosphere, and when (D) ozone, formed in the atmosphere when (E) ozone, formed in the atmosphere from
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for simplification modifier part 'two major pollutants emitted by automobiles' can be removed and then we can look at the answer choices which give us complete meaning. (a)reacts with sunlight has no bearing on the rest of the sentence.(what reacts?) (b)Often visible as smog,ozone is formed in the atmosphere when hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight. gives the proper meaning as how the ozone is formed. (c)ozone is formed in the atmosphere, and when and is unnecessary here. (d)ozone, formed in the atmosphere when - looks incomplete, looks as if the sentence tends to convey something after the forming of ozone, but thts not the case here. (e)same as above.
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The ozone being inert gas is nonreactive Posted from my mobile device 
Last edited by gmat1220 on 18 Mar 2011, 02:34, edited 1 time in total.
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ozone is O3 right? nd oxygen isnt an inert gas :D anywyas out of scope. this Q can be answered wthout tht chemistry knowledge  gmat1220 wrote: The ozone being inert gas is unreactive - it cannot react with sunlight. So the two radicals must be reactive Posted from my mobile device _________________
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Chemistry apart, let us look into some grammar of this text. (A) ozone is formed in the atmosphere from ….. there are two verbs namely ‘ is formed’ and ‘ react’. Notwithastanding the meaning, it is a grammatical flaw to use two verbs for a lone subject without a conjunction (B) ozone is formed in the atmosphere when …. The second part is converted into a subordinate clause by using a subordinate connector ‘ when’; the use of two verbs is justified because of there are now two subjects. Correct choice (C) ozone is formed in the atmosphere, and when ….. Distorts the original meaning. Looks as if Ozone is formed twice, first in the atmosphere and again when the pollutants react. (D) Ozone, formed in the atmosphere when….. the primary clause is a fragment; ' formed' is a past participle and not a verb. (E) ozone, formed in the atmosphere from ….. Distorts the meaning; means that Ozone formed from the pollutants react (should be reacts) with sunlight.
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Re: Often visible as smog, ozone is formed in the atmosphere [#permalink]
10 Mar 2012, 17:19
The answer to this question must be B:
A. This answer choice is correct until we hit the word "from." This last word must introduce a subordinate clause because "hydrocarbons and nitrogen oxides" becomes the subject of the next clause - this subject agrees with the plural verb "react."
B. This is the correct answer choice and the meaning is clear. "When" introduces the subordinate clause.
C. The comma + coordinating conjunction splits the meaning of the sentence. The meaning of the sentence is that ozone is formed because hydrocarbons and nitrogen oxides react with sunlight. However, this sentence splits the elements into separate thoughts. This is confusing.
D. Firstly, without a verb here, the sentence is a fragment. Also, the initial modifier doesn't seem to modify anything - it may seem to modify ozone, but the modifier should modify a clause or the subject of the clause.
E. Same as E. However, in this case, "from" is also incorrect.
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Re: Often visible as smog, ozone is formed in the atmosphere [#permalink]
10 Mar 2012, 18:17
IMO B.
Usage of "when" makes it a proper scientific phenomenon.
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Re: Often visible as smog, ozone is formed in the atmosphere [#permalink]
23 Mar 2012, 12:25
B as ozone is formed "when" 2 pollutants react with sunlight
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Re: Often visible as smog, ozone is formed in the atmosphere [#permalink]
23 Mar 2012, 12:51
Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and
nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
=>
ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides react with sunlight.
(A) ozone is formed in the atmosphere from Sentence ends leaving react with sunlight dangling
(B) ozone is formed in the atmosphere when
(C) ozone is formed in the atmosphere, and when when hydrocarbons and nitrogen oxides react with sunlight what happens?
(D) ozone, formed in the atmosphere when What about ozone thus formed?
(E) ozone, formed in the atmosphere from Although it wouldn't make sense, this could be correct if react were reacts.
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Re: Often visible as smog, ozone is formed in the atmosphere
[#permalink]
23 Mar 2012, 12:51
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