Answer:
Effective - reverse osmosis, microfiltration, distillation
Ineffective - ultraviolet radiation
Step-by-step explanation:
The process of distillation is used to remove majority of harmful soluble chemicals from water such as calcium, phosphorus, magnesium etc. and it is also effective in removing heavy metals such as lead, mercury, arsenic.
Lead can also be removed by reverse osmosis and carbon filters which can remove lead either in ionic form or convert into a coagulant and then filter it out.