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Hardness of Water:Causes, Types and Treatments

Question

Permanent hardness in water is due to the presence of:
$C a^{2 +}, M g^{2 +}$
$C a C l_{2}, M g C l_{2}$
$C a C O_{3}, M g C O_{3}$
all of the above

A

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

B

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

C

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

D

all of the above

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Solution

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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

Q1

Permanent hardness is due to

S O_{4}^{2 -}

and

C l^{-}

of

C a^{2 +}

and

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

If hardness is

100

ppm

C a C O_{3}

, amount of

N a_{2} C O_{3}

required to soften

10

L of hard water is :

View Solution

Q2

Permanent hardness is due to

C l^{⊝}

and

S O_{4}^{2 -}

of

M g^{2 +}

and

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?

View Solution

Q3

"Permanent hardness is due to dissolved bicarbonates of

C a^{2 +}

and

M g^{2 +}

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

View Solution

Q4

Permanent hardness in water is due to the presence of:

View Solution

Q5

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

View Solution