Hardness in water is caused due to the presence of
Dissolved salts of Ca2+Ca^{2+}Ca2+ and Mg2+Mg^{2+}Mg2+
Undissolved CaCO3CaCO_3CaCO3
Undissolved salts of Ca2+Ca^{2+}Ca2+ and Mg2+Mg^{2+}Mg2+
Dissolved sulfates of Potassium
(A) Dissolved salts of Ca2+Ca^{2+}Ca2+ and Mg2+Mg^{2+}Mg2+
Explanation:
