The method used to remove temporary hardness of water is:
- ion-exchange method
- Synthetic resins method
- Calgon's method
- Clark's method
The Correct Option is D
Solution and Explanation
${Ca(HCO_3)_2 + Ca(OH)_2 -> 2CaCO_3 V + 2H_2 O }$
${Mg(HCO_3)_2 + 2Ca(OH)_2 -> 2CaCO_3 V + Mg(OH)_2 V + 2H_2 O}$
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Concepts Used:
Group 2 Elements
The group two or alkaline earth metals are s-block elements with two electrons in their s-orbital. They are alkaline earth metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkaline earth metals are characterized by two s-electrons. This group of elements includes:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)
- Radium (Ra)
Elements whose atoms have their s-subshell filled with their two valence electrons are called alkaline earth metals. Their general electronic configuration is [Noble gas] ns2. They occupy the second column of the periodic table and so-called as group two metals also.