Acid rain is caused by the pollution of environment by

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Q: 5 (IAS/2013)
Acid rain is caused by the pollution of environment by
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,631,72,32,26,14,631

keywords: 

{'acid rain': [1, 0, 2, 3], 'pollution': [3, 0, 1, 0], 'ozone': [3, 0, 3, 5], 'carbon dioxide': [2, 0, 5, 6], 'carbon monoxide': [3, 0, 1, 1], 'environment': [2, 0, 0, 3], 'sulphur dioxide': [0, 0, 0, 1], 'nitrogen': [1, 1, 0, 2]}