Class 9th · Chemistry · Chapter 10
Chapter 10: Environmental Chemistry
Chapter 10 of the Punjab Board Class 9th Chemistry textbook runs from page 133 to 148. Open any of those pages in GenZ Books, tap a question, and the answer is worked from this chapter.
Open Chapter 10 of Chemistry in GenZ Books
The same Class 9th textbook, page for page. Tap any question and get the answer worked from that chapter — English and Urdu.
What you will learn
- State that composition of clean, dry air is approximately 78% nitrogen, N2, 21% oxygen, O2, and the remainder as a mixture of noble gases and carbon dioxide, COz
- State the major sources of air pollutants (Some examples include: a. carbon dioxide from the complete combustion of carbon-containing fuels b. carbon monoxide and particulates from the incomplete combustion of carbon- containing fuels c. methane from the decomposition of vegetation and waste gases from digestion in animals d. oxides of nitrogen from car engines e. sulfur dioxide from the combustion of fossil fuels which contain sulfur compounds f. ground level ozone from reactions of oxides of nitrogen, from car engines, and volatile organic compounds, in presence of light)
- State the adverse effects of air pollutants (Some examples include: a. carbon dioxide: higher levels of carbon dioxide leading to increased global warming, which leads to climate change b. carbon monoxide: toxic gas c. particulates: increased risk of respiratory problems and cancer d. methane: higher levels of methane leading to increased global warming, which leads to climate change e. oxides of ni