Question

Hard water is caused due to the presence of –

a) Salts of Ca and Mg. c) Scum

b) Salts of Na and K d) Detergents.​

Answer 1

B hope it helps ...............

Answer 2

Hard water is caused due to the presence of salt of Ca and Mg. (Option A)

• The hard water is a type of water which produces very less amount of foam when soap is added into the water.

• The hardness of the water is caused by presence of the salt of calcium and magnesium,like calcium chloride and magnesium chloride.

• Removal of these salts is a very difficult process and that's why the transformation of hard water to soft water is very difficult.