Concept:Temporary hardness is caused by dissolved bicarbonates of calcium and magnesium.
Explanation:Boiling removes temporary hardness by decomposing these soluble bicarbonates.
Calcium bicarbonate,
Ca(HCO3)2, breaks down to form insoluble calcium carbonate,
CaCO3.
Magnesium bicarbonate,
Mg(HCO3)2, similarly forms insoluble magnesium carbonate,
MgCO3.
These insoluble carbonate precipitates settle out of the water.
Filtration only removes suspended solids, not dissolved bicarbonates.
Sedimentation also only removes suspended particles.
Chlorination kills microorganisms but does not affect hardness.
Therefore, boiling is the suitable method for removing temporary hardness.
Answer:A. Boiling