Which of the following is added to remove permanent hardness of water?

baking soda

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blue vitriol

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washing soda

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milk of magnesia

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Solution

The correct option is C washing soda
By adding Na $_{2}$ Co $_{3}$ , all the Ca $^{+ 2}$ and and Mg $^{+ 2}$ ions which causes permanent hardness are replaced by Na $^{+}$ , which doesn't cause hardness.

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Which of the following is added to remove permanent hardness of water?

The correct option is C washing sodaBy adding Na2Co3, all the Ca+2 and and Mg+2 ions which causes permanent hardness are replaced by Na+, which doesn't cause hardness.

The correct option is C washing soda
By adding Na $_{2}$ Co $_{3}$ , all the Ca $^{+ 2}$ and and Mg $^{+ 2}$ ions which causes permanent hardness are replaced by Na $^{+}$ , which doesn't cause hardness.