The hardness of water in CaCO3CaCO_3CaCO3 equivalents containing MgSO4MgSO_4MgSO4 (Mol. Wt = 120) with concentration of 12 mg/ L is
100 mg/L
10 mg/L
5 mg/L
1 mg/L
(B) 10 mg/L
Explanation: