Which class of chemicals is linked to the decrease in the amount of ozone in the upper atmosphere of the earth ?
Which class of chemicals is linked to the decrease in the amount of ozone in the upper atmosphere of the earth ?
Chlorofluorocarbons () are the class of synthetic chemicals linked to the decrease in the amount of ozone () in the upper atmosphere of the Earth.
Marking Scheme
- 11 Mark: Correctly identifying Chlorofluorocarbons ().
Hint
Recall the synthetic chemicals used in refrigerators and fire extinguishers that contain chlorine, fluorine, and carbon.
Quick Oral Answer
Chlorofluorocarbons, commonly known as , are responsible for ozone depletion.
Analysis & Explanation
According to the NCERT text, the decrease in the amount of ozone in the atmosphere since the 1980s has been linked to synthetic chemicals like chlorofluorocarbons (), which are widely used as refrigerants and in fire extinguishers.
Common Mistakes
- 1Mentioning carbon dioxide () or general greenhouse gases instead of chlorofluorocarbons ().
Interesting Facts
A single chlorine atom released from a molecule in the stratosphere can destroy thousands of ozone molecules before being removed from the atmosphere.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2012?
This question carries 1 mark in the CBSE Class 10 Science 2012 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Our Environment" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Ozone Layer Depletion" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2012 paper?
This is a Very Short Answer question from Section A in the CBSE Class 10 Science 2012 paper.