Which type of waste is highly lethal in large quantities?

The radioactive waste leakage incident occurred at which of the following places?

High level radioactive waste can be managed in which of the following ways?

The chemical which causes damage to $WBC$, bone marrow, spleen, lymph nodes, and lungs is

The Chernobyl incident is concerned with:

Which of the following statement$(s)$ is/are correct?
$(i)$ Nuclear energy is a non-polluting way of generating electricity.
$(ii)$ Radioactive waste leakage incidents occurred at Three Mile Island and Chernobyl.
$(iii)$ Prolonged exposure to radioactive waste can cause cancer.
$(iv)$ Radioactive waste is recyclable.
$(v)$ High doses of radiation are lethal.