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Alum increases the rate of sedimentation because,alum being an external agent causes the particles present in the container to colloid together and form heavier particles, as heavier particles sink in water these particles settle down therefore,increasing the speed of sedimentation
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Alum increases the rate of sedimentation because it is a coagulant. ... When alum is added to the muddy water, the mud particle begins to accumulate and settle down to the base as sedimentation. The presence of alum mud particles forms precipitates and attracts other precipitating particles.
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