Question

MCO (100
03. The general unit used for measuring
hardness of water is
(A) gm/Lit
(B) ppm
(C) amu
(D) N/m2​

Answer 1

Answer:

gm per litre

Explanation:

General guidelines for classification of waters are: 0 to 60 mg/L (milligrams per liter) as calcium carbonate is classified as soft; 61 to 120 mg/L as moderately hard; 121 to 180 mg/L as hard; and more than 180 mg/L as very hard.