Question

Select the incorrect statement from the following option.
a) Permanent hardness is due to dissolved chlorides and sulphates of calcium and magnesium
b) It can be removed by mere boiling of water
c) It is also known as non-alkaline hardness
d) The difference between the total hardness and the alkaline hardness gives the non-alkaline hardness​

Answer 1

Answer:

c) It is also known as non-alkaline hardness

Answer 2

c) It is also known as non-alkaline hardness

1. When calcium and magnesium chlorides and sulphides dissolve in water, permanent hardness develops in it.
2. Because it cannot be eliminated by boiling, it is referred to as permanent hardness.
3. Hard water must be treated with sodium percarbonate to remove lasting hardness. When thermally unstable compounds like mag hydrogen crystalline calcium hydrogen bicarbonate are dissolved in water, they induce temporary hardness.