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Permanent Hardness

Which of the ...

Question

Which of the following is not true?

A

Hardness of water depends on its behaviour towards soap

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B

The temporary hardness is due to the presence of Ca and Mg bicarbonates

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C

Permanent hardness is due to the presence of soluble Ca and Mg sulphates, chlorides and nitrates

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D

Permanent hardness can be removed by boiling the water

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Solution

The correct option is D
Permanent hardness can be removed by boiling the water

The hardness of water depends on its behaviour towards soap. Hard water is water that does not give lather with soap.

The presence of calcium and magnesium salts in the form of hydrogencarbonate, chloride and sulphate in water makes water hard.

The temporary hardness in water is due to the presence of magnesium and calcium hydrogen carbonates. It can be removed by boiling.

Permanent hardness in water is due to the presence of soluble salts of calcium and magnesium, chlorides and sulphates.

Permanent hardness of water cannot be removed by boiling it.

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Similar questions

Q. Permanent hardness is due to presence of soluble salts of Mg and Ca in the form of chlorides and sulphates in

H_{2} O

. It can be removed by:

Q. The Permanent hardness of water is due to compound

A

. One of the method to remove permanent hardness of water is

B

whereas the temporary hardness of water is due to compound

X

. Boiling this compound converts

X

Y

A, B, X, and Y,

respectively can be:
(Given:

M = M g, C a

)

Q. Permanent hardness of water is due to the presence of the chlorides and sulphates of Ca, Mg and Fe.
If this is true enter 1, if false enter 0.

Q. Permanent hardness of water is due to the presence of the bicarbonates of Ca, Mg and Fe.
If this is true enter 1, if false enter 0.

Q. Match the following :

A) Hardness of water	(1) Removed by simple boiling
B) Temporary hardness	(2) Carbonates, chlorides, and sulphates of $C a$ and $M g$
C) Calgon	(3) Bicarbonates, chlorides and sulphates of $C a$ and $M g$
D) Permutit	(4) $N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$
	(5) $N a [N a_{4} (P O_{3})_{6}]$

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