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

Option 1 - CaCO3 and Mg(OH)2

Option 2 - CaCO3 and MgCO3

Option 3 - Ca(OH)2 and MgCO3

Option 4 - Ca(OH)2 and Mg(OH)2

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Vishal Baghel | Contributor-Level 10

6 months ago

Correct Option - 1

Detailed Solution:

During removal of temporary hardness of water.

$\begin{array}{l} M g {(H C O_{3})}_{2} \overset{B o i l}{\to} M g {(O H)}_{2} + 2 C O_{2} ↑ \\ C a {(H C O_{3})}_{2} \overset{B o i l}{\to} C a C O_{3} + H_{2} O + C O_{2} \end{array}$

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Reason R: Phenolphthalein is a weak acid. It doesn’t dissociate in basic medium.

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