Environmental Engineering
The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of water The correct answer is

(ii) and (iii)
(i)and(iv)
(ii) and (iv)
(i) and (ii)

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Environmental Engineering
The major disadvantage of lime soda process of water softening is that

Huge amount of precipitate is formed which creates a disposal problem
The effluent cannot be reduced to zero hardness
It is unsuitable for turbid and acidic water
It is unsuitable for softening the water of excessive hardness

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