GK
BASIC GENERAL KNOWLEDGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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to remove gases
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to remove salts
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to kill bacteria
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for coagulation of mud particles
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Detailed explanation-1: -Alum helps in purifying water by aluminium which coagulates the mud particles. Because of the high charge on the aluminium ion (Al+3), it helps the small particles of suspended solids to group together until they are of such size that they sink and can be removd.
Detailed explanation-2: -Alum is generally used to purify muddy water. This type of process is done by the process called coagulation in which stability of the lyophobic sols is due to presence of charge on colloidal particles.
Detailed explanation-3: -Alum helps purifying water by coagulating the mud particles forming a gelatinous precipitate. Due to coagulation of mud particles, size of particle increase and the become heavy and settle down at the bottom by which water id purified.