Soil containing both $Al$ and $Fe$ is called

The metal ion responsible for the Minamata disease is

Which of the following is least biodegradable?

$A$ factory was started near a village. Soon,the villagers began experiencing the presence of undesirable gases in the atmosphere,leading to symptoms like headaches,chest pain,colds,dry throats,and breathing difficulties. The villagers blamed the smoke emitted from the factory chimney for these problems. Describe what might have happened and provide the chemical equations to support your explanation.

The $BOD$ values for pure water and highly polluted water are respectively

Among the following compounds,which one is not primarily responsible for the depletion of the ozone layer in the stratosphere?