Different samples of water containing each 100 ppm of CaCl_(2),MgSO_(4),CaS_(4) and MgCl_(2) among them which will have greater hardness/

Different samples of water containing each 100 ppm of CaCl_(2),MgSO_(4

1.	Different samples of water containing each 100 ppm of CaCl_(2),MgSO_(4),CaS_(4) and MgCl_(2) among them which will have greater hardness/
Answer» `CaCl_2` `MgCl_2` `CaSO_4` `MgSO_4` ANSWER :B