Calgon causes the softening of hard wate...

Calgon causes the softening of hard water by

sequestraction of `Ca^(2+)` and `Mg^(2+)` ion

sequestraction of `Cl^(-)` and `SO_(4)^(2-)` ion

precipitating the `Ca^(2+)` and `Mg^(2+)` ions as phophates

precipitating the `Ca^(2+)` and `Mg^(2+)` ions as sulphates.

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The correct Answer is:

It causes sequestration of `Ca^(2+)` and `Mg^(2+)` of hard water.

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