particle size is decreased

the surface area of tank is increased

the depth of tank is decreased

none of the above

increasing the depth of tank

decreasing the depth of tank

increasing the surface area of tank

decreasing the surface area of tank

less and more

less and less

more and less

more and more

(i) and (ii)

(i)and(iv)

(ii) and (iii)

(ii) and (iv)

2 to 4

4 to 6

6 to 8

8 to 10