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Uses of Water

Permanent har...

Question

Permanent hardness of water is due to presence of :
a) hydrogen carbonates of calcium and magnesium
b) chlorides and sulphatesof calcium and magnesium
c) hydrogen carbonates and sulphatesof calcium and magnesium
d) chlorides and carbonatesof calcium and magnesium

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Solution

Permanent hardness of water is due to the presence of chlorides and sulphates of calcium and magnesium.

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Q. Assertion :Permanent hardness of water can be removed by using washing soda Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates

Q. 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 of water can be removed by:

Q. Permanent hardness of water is due to the presence of chlorides and salts of calcium and magnesium. It can be removed by using .

Q. Consider the following statements:
Hard water does not give lather with soap because hard water contains:
(a) calcium bicarbonate
(b) magnesium bicarbonate
(c) chlorides of calcium and magnesium
(d) sulphates of calcium and magnesium
Which of these statements are correct?

Permanent hardness is caused by the dissolved __(sulphates/bicarbonates) of calcium and magnesium.

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