Chlorine gas reacts with the aromatic ring of lignin to form which of the following substances?

Which of the following statements is $NOT$ in accordance with the fundamental principles of Green Chemistry?

Which of the following causes damage to buildings containing calcium and is responsible for causing cough and throat congestion in humans?

State the measures to control environmental pollution.

Most hazardous metal pollutant of automobile exhaust is

Over $10 \ ppm$ fluoride causes