(i) and (ii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
2 to 4
4 to 6
6 to 8
8 to 10
1 to 2 minutes
30 to 45 minutes
2 to 6 hours
2 to 6 days
does not require alkalinity in water for flocculation
does not affect pH value of water
increases pH value of water
decreases pH value of water
sulphuric acid
copper sulphate
lime
sodium permanganate