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

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

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Environmental Engineering
In lime-soda process

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
Only noncarbonated hardness is removed
Only carbonate hardness is removed

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