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Presence of H2S in raw water (to be chlorinated) results in the

A. Reduced softening capacity of zeolite

B. Increased dosage of chlorine to provide a disinfecting residual in the water

C. Easy removal of its hardness

D. None of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  18. Calgon used in water treatment is chemically
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  20. Cement setting under water employs a/an __________ process.
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