Environmental Engineering
The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Only (iii)
Both (i) and (iii)
Both (i) and (ii)
Only (i)

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Environmental Engineering
In lime-soda process

Only carbonate hardness is removed
Only noncarbonated hardness is removed
Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness
Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness

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