In a local water supply, lead levels have increased due to corroded pipes. drag each item to indicate whether it is effective or ineffective in removing chemical contaminants such as lead.

Effective - reverse osmosis, microfiltration, distillation

Ineffective - ultraviolet radiation

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.