Cadmium pollution may cause

Which chemical compound caused the death of thousands of people in the Bhopal gas tragedy?

The following water samples are given with their $BOD$ values. Which sample has the lowest level of pollution?
Sample $w - 6 \ mg/L$,Sample $x - 6.5 \ mg/L$
Sample $y - 7 \ mg/L$,Sample $z - 10.3 \ mg/L$

Which of the following is responsible for a sound level of $150 \, dB$ or more?

In which one of the following have the $BOD$ (Biochemical Oxygen Demand) of sewage $(S)$,distillery effluent $(DE)$,paper mill effluent $(PE)$,and sugar mill effluent $(SE)$ been arranged in ascending order?

If we continuously add sewage water into a river,the $BOD$ of the river will: