(B) Temporary hardness in water is primarily due to the presence of calcium and magnesium bicarbonates. Adding calcium hydroxide $(Ca(OH)_2)$,also kno

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(B) Temporary hardness in water is primarily due to the presence of calcium and magnesium bicarbonates. Adding calcium hydroxide $(Ca(OH)_2)$,also known as lime,precipitates these bicarbonates as insoluble carbonates. The chemical reaction is: $Ca(HCO_3)_2 + Ca(OH)_2 \to 2CaCO_3 \downarrow + 2H_2O$ Thus,option $(B)$ is correct.

Class 11 Chemistry Hydrogen Water or hydride of oxygen

Medium

Temporary hardness may be removed from water by adding

A
$CaCO_3$
B
$Ca(OH)_2$
C
$CaSO_4$
D
$HCl$

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Class 11

Chemistry Questions

Chapter

Hydrogen

Subtopic

Water or hydride of oxygen

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

Medium

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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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