1.

Permanent hardness of water cannot be removed by which one of the following methods ?

Answer»

Treatment with washing soda
CALGON's method
Boiling
Ion exchange method

Solution :Magnesium is a chemical element with symbol Mg.
Magnesium is the ninth most abundant element in the universe . Its use as a structural MATERIAL is limited SINCE it burns at relatively low temperatures . Magnesium is frequently alloyed with aluminium , which makes aluminium EASIER to roll , EXTRUDE and weld.


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