Which of the following is a chlorinated hydrocarbon?

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

Mercury pollution causes:

Acid rain is caused by,or recent reports of acid rain in some industrial cities are due to the effect of atmospheric pollution by:

In a pond,if there is too much wastage,then the $BOD$ of the pond will:

$CNG$ is considered a more efficient fuel. Which of the following statements is incorrect regarding it?