Which of the following are water intensive crops?
Which of the following are water intensive crops?
Options
Option (c) is correct. Carbon monoxide () is the most poisonous product formed by the incomplete combustion of fossil fuels.
Marking Scheme
- 1Correct option (c) - 1 Mark
Hint
This gas is colorless, odorless, and binds strongly with hemoglobin in our blood, preventing oxygen transport.
Quick Oral Answer
Carbon monoxide () is highly poisonous because it binds irreversibly with hemoglobin in our red blood cells to form carboxyhemoglobin, preventing the transport of oxygen to vital organs.
Analysis & Explanation
When fossil fuels burn in a limited supply of oxygen, incomplete combustion occurs, leading to the formation of carbon monoxide (). Carbon monoxide is a highly toxic, colorless, and odorless gas. It binds with hemoglobin in human blood to form carboxyhemoglobin, which is far more stable than oxyhemoglobin. This severely reduces the oxygen-carrying capacity of the blood, leading to hypoxia and potentially death. Carbon dioxide (), nitrogen dioxide (), and sulphur dioxide () are also pollutants, but carbon monoxide is directly and acutely poisonous to aerobic life forms.
Common Mistakes
- 1Selecting carbon dioxide () because it is a well-known greenhouse gas, but it is not acutely poisonous like carbon monoxide.
- 2Selecting sulphur dioxide () which causes acid rain but is not the primary direct poison from incomplete combustion of carbon-based fuels.
Interesting Facts
Carbon monoxide has an affinity for hemoglobin that is about 200 times greater than that of oxygen, which is why even small concentrations in inhaled air can be extremely dangerous.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2020?
This question carries 1 mark in the CBSE Class 10 Science 2020 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 "Air Pollution and Fossil Fuels" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2020 paper?
This is a MCQ question from Section A in the CBSE Class 10 Science 2020 paper.