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

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Environmental Engineering
The polluted water is one which

Is safe and suitable for drinking and domestic use
Consists of undesirable substances rendering it unfit for drinking and domestic use
Contains pathogenic bacteria
Is contaminated

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