Ncert Exercises & Solutions

Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

a. Chlorides of Ca and Mg in water

b. Sulphates of Ca and Mg in water

c. Hydrogen carbonates of Ca and Mg in water

d. Carbonates of alkali metals in water.

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Permanent hardness is due to the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water. Permanent hardness is not removed by boiling.

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