Which one among the following methods is not effective in removing arsenic from contaminated ground water ?

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Q: 37 (NDA-I/2011)

Which one among the following methods is not effective in removing arsenic from contaminated ground water ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,46,53,46,18,12,23

keywords: 

{'contaminated ground water': [0, 0, 0, 1], 'adsorption': [0, 0, 0, 1], 'reverse osmosis': [0, 0, 1, 0], 'ion exchange': [0, 0, 0, 1], 'boiling': [0, 0, 0, 6], 'methods': [5, 0, 2, 10], 'coagulation': [1, 0, 0, 0]}