11. Estimation of hardness of water by EDTA method is used to determine
12. Hard water can be softened by passing it through
13. Hard water is unfit for use in boilers for generating steam because
14. Hardness in water is caused due to the presence of
15. Hardness of water does not
16. Hardness of water is expressed in equivalents of
17. Hardness of water is measured in
18. Liquid chlorine is a most effective
19. One of the following chemical acts as both coagulant and softening agent
20. One of the following is an example for cation exchanging resin
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