1.Hard water when passed through ion-exchange resin containing RCOOHRCOOHRCOOH groups becomes free from:a.Cl−Cl^-Cl− ionsb.SO42−SO_4^{2-}SO42− ionsc.H3O+H_3O^+H3O+ ionsd.Ca2+Ca^{2+}Ca2+ ionsLogin to continueOnly logged in users canattempt or see the solution.
