1.

We know that lime required for softening of water is x{temp Ca hardness+2.Mg hardness+perm(Mg+Fe+3Al)hardness+1/2 HCL+H2SO4-NaAlO2-CO2 }-all are in terms of mg of CaCO3. Here x=?

A. 7.4
B. 0.74
C. 74
D. 740
Answer» C. 74


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