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`{:(,"Column A",,,"Column B"),(A.,"Hard water","( )",a.,"Reverse osmosis"),(B.,"Soft water","( )",b.,"Rain water"),(C.,"Desalinated water","( )",c.,"Presence of "Ca^(+2)andMg^(2+)),(D.,"Lake water","( )",d.,"Scum formation"),(,,"( )",e.,"Lather formation"):}`

Answer» Correct Answer - A `rarr` c, d
B `rarr` e
C `rarr` a
D `rarr` b
A - c, d Hard water contains `Ca^(+2)` and `Mg^(2+)` ions and form scum with soap.
B - e Soft water forms lather with soap.
C - a Reverse osmosis process is used for desalination.
D - b Rain water is the purest form of natural water stored in lakes.


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