(A) The hardness of water is primarily caused by the presence of dissolved calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions in the form of their hyd

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(A) The hardness of water is primarily caused by the presence of dissolved calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions in the form of their hydrogen carbonates,chlorides,and sulphates. Among the given options,$Ca^{2+}$ is responsible for causing hardness in water.

Class 11 Chemistry Hydrogen Water or hydride of oxygen

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Which of the following ions will cause hardness in water?

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A
$Ca^{2+}$
B
$Na^{+}$
C
$Cl^{-}$
D
$K^{+}$

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Chapter

Hydrogen

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Water or hydride of oxygen

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Which of the following is a good scientific method to detect the presence of water in a liquid?

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Match the following methods for treating hardness of water with their corresponding reagents used.
List-$I$ List-$II$
$A$. Treatment with washing soda $I$. $Ca(OH)_2$
$B$. Calgon's method $II$. $Na_2CO_3$
$C$. Clark's method $III$. $NaAlSiO_4$
$D$. Zeolite/permutit process $IV$. $Na_6P_6O_{18}$

The correct match is:

List-$I$	List-$II$
$A$. Treatment with washing soda	$I$. $Ca(OH)_2$
$B$. Calgon's method	$II$. $Na_2CO_3$
$C$. Clark's method	$III$. $NaAlSiO_4$
$D$. Zeolite/permutit process	$IV$. $Na_6P_6O_{18}$

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