Temporary hardness in water is due to which one of the following of Ca

Temporary hardness in water is due to which one of the following of Calcium and Magnesium ?

[amp_mcq option1=”Hydrogen carbonates” option2=”Carbonates” option3=”Chlorides” option4=”Sulphates” correct=”option1″]

This question was previously asked in

UPSC NDA-1 – 2017

Temporary hardness in water is caused by the presence of dissolved bicarbonates (also known as hydrogen carbonates) of calcium and magnesium, such as Ca(HCO3)2 and Mg(HCO3)2. These can precipitate out as insoluble carbonates when the water is boiled, thereby removing the hardness.

Temporary hardness is due to soluble bicarbonates of calcium and magnesium and can be removed by boiling.

Permanent hardness is caused by dissolved chlorides and sulphates of calcium and magnesium (e.g., CaCl2, MgCl2, CaSO4, MgSO4) and cannot be removed by boiling. Water softening methods are required to remove permanent hardness.

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