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(A) Temporary hardness in water is due to the presence of magnesium and calcium hydrogen carbonates.When water is boiled,magnesium hydrogen carbonate

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$CaCO_3$ and $Mg(OH)_2$

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(A) Temporary hardness in water is due to the presence of magnesium and calcium hydrogen carbonates.When water is boiled,magnesium hydrogen carbonate is converted into insoluble magnesium hydroxide:$Mg(HCO_3)_2 \xrightarrow{	ext{Boil}} Mg(OH)_2 \downarrow + 2CO_2 \uparrow$Calcium hydrogen carbonate is converted into insoluble calcium carbonate:$Ca(HCO_3)_2 \xrightarrow{	ext{Boil}} CaCO_3 \downarrow + H_2O + CO_2 \uparrow$Thus,the temporary hardness is removed by converting them into $CaCO_3$ and $Mg(OH)_2$.

List-$I$	List-$II$
$1.$ Heavy water	$(a)$ Bicarbonates of $Ca$ and $Mg$ in water
$2.$ Temporary hard water	$(b)$ No foreign ions in water
$3.$ Soft water	$(c)$ $D_2O$
$4.$ Permanent hard water	$(d)$ Sulphates and chlorides of $Ca$ and $Mg$ in water

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to ....

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