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

Chlorides of Ca and Mg in water

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Sulphates of Ca and Mg in water

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Hydrogen carbonates of Ca and Mg in water

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Carbonates of alkali metals in water

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Solution

The correct options are
A Chlorides of Ca and Mg in water
B Sulphates of Ca and Mg in water
The permanent hardness is due to the presence of chlorides
and sulphates of magnesium and calcium.

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Similar questions

H_{2} O

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

A

B

X

X

Y

A, B, X, and Y,

M = M g, C a

	List - I		List - II
1.	Heavy water	A.	Bicarbonates of $M g$ and $C a$ in water
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 $M g$ and $C a$ in water

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