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 ?

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]}

The correct answer is option 1: Boiling. Boiling water is not an effective method for removing arsenic from contaminated groundwater. It is important to note that boiling can kill bacteria and other microorganisms, making the water safe to drink in terms of microbiological contamination, but it does not remove chemical contaminants like arsenic.

Option 2: Reverse osmosis is an effective method for removing arsenic from contaminated groundwater. Reverse osmosis uses a semi-permeable membrane to separate impurities from the water, including arsenic.

Option 3: Ion exchange is also an effective method for removing arsenic from contaminated groundwater. It involves using a resin to exchange ions in the water, effectively trapping the arsenic and removing it from the water.

Option 4: Coagulation-adsorption is another effective method for removing arsenic from contaminated groundwater. Coagulation involves adding chemicals to the water to create floc, which attracts and binds to the arsenic. Adsorption then occurs when the floc particles are filtered out, removing the arsenic from the water.

It is important to choose the appropriate method for removing arsenic based on the specific situation and water quality.