The permanent hardness of water is due to the presence of:

sulphates of

C a

and

M g

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carbonates of

C a

and

M g

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bicarbonates of

C a

and

M g

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phosphates of

C a

and

M g

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Solution

The correct option is B sulphates of $C a$ and $M g$
Permanent hardness of water is due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling.

The permanent hardness of water is mainly due to the presence of sulphates of $C a$ and $M g$ , i.e., calcium sulphate and magnesium sulphate.

Hence, option A is the correct answer.

Suggest Corrections

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) $N a [N a_{4} (P O_{3})_{6}]$

List I	List II
1. Heavy water	A) Bicarbonates of $M g$
2. Temporary hard water	B) No foreign ions in water
3. Soft water	C) $D_{2} O$
4. Permanent hard water	D) Sulphates and Chlorides of $M g$ & $C a$ in water