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Hardness of Water:Causes, Types and Treatments

Permanent har...

Question

Permanent hardness in water is due to the presence of:

A

C a^{2 +}, M g^{2 +}

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B

C a C l_{2}, M g C l_{2}

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C

C a C O_{3}, M g C O_{3}

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D

all of the above

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Solution

The correct option is B $C a C l_{2}, M g C l_{2}$
Permanent hardness in water is due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium. It is not precipitated by boiling. These minerals in water can cause some everyday problems. Hard water may also shorten the life of plumbing and water heaters. The limescale can build up on the inside of the pipe restricting the flow of water or causing a blockage.

Hence, option B is correct.

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Similar questions

Q. Permanent hardness is due to

S O_{4}^{2 -}

C l^{-}

C a^{2 +}

M g^{2 +}

and is removed by the addition of

N a_{2} C O_{3}

.

C a S O_{4} + N a_{2} C O_{3} ⟶ C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} ⟶ C a C O_{3} + 2 N a C l

100

C a C O_{3}

N a_{2} C O_{3}

required to soften

10

L of hard water is :

Q. Permanent hardness is due to

C l^{⊝}

S O_{4}^{2 -}

M g^{2 +}

C a^{2 +}

and is removed by adding

N a_{2} C O_{3}

C a S O_{4} + N a_{2} C O_{3} \to C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a C l

Which of the following statements is/are correct?

Q. "Permanent hardness is due to dissolved bicarbonates of

C a^{2 +}

M g^{2 +}

."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Q. Permanent hardness of water is due to the presence of ___________.

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

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