Radon in water may be removed by ________________.

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Multiple Choice

Radon in water may be removed by ________________.

Explanation:
Radon in water is a dissolved gas, so the way to lower its levels is to remove the gas from the water and vent it away. Aeration does this by exposing water to air, which encourages radon to move from the water into the outdoor air. Filtration can also reduce radon if the filter uses media like activated carbon that adsorbs dissolved radon. Distillation or boiling would tend to release radon into the room air, not achieve a safe, practical reduction, and sedimentation doesn’t affect dissolved gases at all. So the effective options are filtration or aeration.

Radon in water is a dissolved gas, so the way to lower its levels is to remove the gas from the water and vent it away. Aeration does this by exposing water to air, which encourages radon to move from the water into the outdoor air. Filtration can also reduce radon if the filter uses media like activated carbon that adsorbs dissolved radon. Distillation or boiling would tend to release radon into the room air, not achieve a safe, practical reduction, and sedimentation doesn’t affect dissolved gases at all. So the effective options are filtration or aeration.

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