Which of the following pesticides are non-biodegradable?

Which of the following gases causes pollution?

According to the Euro $III$ norms,what was the controlled limit for sulfur content in petrol?

Catalytic converters,which have expensive metals as catalysts,are fitted into automobiles for reducing emission of poisonous gases. Which of the following is $NOT$ used in them?

The Bhopal gas tragedy in $1984$ was caused by the leakage of which gas?

Which of the following radiations is non-ionizing?