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What is the reason for the hardness of water? |
Ca2+ and K+ Mg2+ and K+ Ca2+ and Mg2+ Ba2+ and Zn2+ |
Ca2+ and Mg2+ |
The correct answer is option 3. Ca2+ and Mg2+. The hardness of water is primarily caused by the presence of calcium ions (Ca²⁺) and magnesium ions (Mg²⁺). These ions are dissolved in water and can form insoluble compounds, such as carbonates and sulfates, which contribute to the hardness. So, the correct answer is: Ca²+ and Mg²+ |
