Which of the following can effectively remove all types of hardness of water ?A. Washing sodaB. SoapC. Slaked limeD. Boiling.

Which of the following can effectively remove all types of hardness of

1.	Which of the following can effectively remove all types of hardness of water ?A. Washing sodaB. SoapC. Slaked limeD. Boiling.
Answer» Correct Answer - B Washing sode can effectively remove hardness due to `Ca^(2+)` ions, but cannot remove the hardness due to `Mg^(2+)` ions as `MgCO_(3)` is quite soluble in water. Slaked lime can remove temporary hardness, but permanent hardness due to `Mg^(2+)` when removed with `Ca(OH)_(2)` introduces `Ca^(2+)` ions in solution, thus making it hard once again. Boiling can remove only temporary hardness. Soap can effectively remove all types of hardness.

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Which of the following can effectively remove all types of hardness of water ?A. Washing sodaB. SoapC. Slaked limeD. Boiling.

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