Which of the following is a secondary pollutant?

Which of the following industries produce phenolic compounds and suspended solids as waste?

Consider the following.
Assertion $(A)$: $CO$ is poisonous to living beings.
Reason $(R)$: $CO$ binds to haemoglobin forming carboxyhaemoglobin,which is less stable than oxygen-haemoglobin complex.
Correct answer is

Write a short note on the effect of Global warming and Greenhouse effect on environment.

Which among the following statements is against the principles of green chemistry?

The maximum prescribed concentration of copper in drinking water is ........ $ppm$.