GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Permanent hardness of water may be removed by the addition of
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alum
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sodium carbonate
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lime
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potassium permanganate
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Explanation:
Detailed explanation-1: -Sodium carbonate is water soluble in nature and hence, adds a large amount of carbonate ions to the water. In the above reaction, the calcium ions come from hard water and the carbonate ions from the sodium carbonate. And thereby, hardness is removed.
Detailed explanation-2: -The permanent hardness can be removed by adding lime and soda. Explanation: The permanent hardness can be removed by adding Ca (OH)2 as lime and sodium carbonate as soda in water and the process is called lime soda process.
Detailed explanation-3: -Removal of hardness of water Chemical Process of Boiling Hard Water. Adding Slaked Lime (Clarkâs Process) Adding Washing Soda. Calgon Process.
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