The underground water is free from dissolved salts of calcium and magnesium.

True

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False

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Solution

The correct option is B False
Groundwater always contains some dissolved salts of calcium and magnesium like calcium chloride (CaCl₂), calcium carbonate (CaCO₃), and Magnesium carbonate (MgCO₃) in a very little amount as compared to river and lake water. The presence of these salts is also known as the hardness of the water. as compared to river and lake water.
Hence the given statement is false.

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