Carbon and its Compounds Quiz - ICSE Class 8 Science

Free practice quiz: Carbon and its Compounds (ICSE Class 8 Science). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 49 multiple-choice questions on Carbon and its Compounds, and 49 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. The process of converting coal into coke, coal gas, and coal tar is known as:

   1. Combustion
   2. Distillation
   3. Cracking
   4. Pyrolysis
   Show answer

   Answer: D. Pyrolysis

   Pyrolysis is the thermal decomposition of materials at elevated temperatures in an inert atmosphere. This is precisely what happens when coal is heated strongly in the absence of air to produce coke, coal gas, and coal tar.

2. Carbon monoxide (CO) is a toxic gas because it:

   1. Reacts vigorously with oxygen
   2. Forms carbonic acid in the lungs
   3. Combines with hemoglobin in the blood, reducing oxygen transport
   4. Dissolves readily in water to form a weak acid
   Show answer

   Answer: C. Combines with hemoglobin in the blood, reducing oxygen transport

   Carbon monoxide binds to hemoglobin in red blood cells with a much higher affinity than oxygen. This forms carboxyhemoglobin, which reduces the blood's capacity to carry oxygen to the body's tissues, leading to oxygen deprivation and toxicity.

3. Which substance is used to remove color from colored solutions by adsorption?

   1. Sodium chloride
   2. Activated charcoal
   3. Sulfuric acid
   4. Water
   Show answer

   Answer: B. Activated charcoal

   Activated charcoal has a highly porous structure with a large surface area. This large surface area allows it to adsorb impurities, including colored substances, from solutions. This process is used in decolorization.

4. Which allotrope of carbon has a structure described as 'sheets' of carbon atoms arranged in hexagonal rings, with weak forces between the sheets?

   1. Diamond
   2. Fullerene
   3. Amorphous carbon
   4. Graphite
   Show answer

   Answer: D. Graphite

   Graphite's structure consists of planar layers of carbon atoms, where each carbon is bonded to three others in hexagonal rings. These layers are held together by weak van der Waals forces, allowing them to slide over each other.

5. Which statement about carbon dioxide is incorrect?

   1. It is a greenhouse gas.
   2. It is essential for photosynthesis.
   3. It is produced by respiration.
   4. It is less dense than air.
   Show answer

   Answer: D. It is less dense than air.

   Carbon dioxide (CO2) has a molar mass of approximately 44 g/mol. The average molar mass of dry air is about 29 g/mol. Therefore, carbon dioxide is denser than air and will settle at the bottom of a container. The other statements are correct.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following compounds is a saturated hydrocarbon with the molecular formula C5H12?
2. The unique property of carbon that allows it to form a large number of compounds by bonding with itself and other elements is called:
3. Which of the following is a product of the complete combustion of methane (CH4)?
4. The allotrope of carbon that is a soft, greasy solid and a good conductor of electricity is:
5. A hydrocarbon with the molecular formula C3H6 belongs to which homologous series?
6. What is the IUPAC name for the hydrocarbon with the formula CH3-CH2-CH2-CH3?
7. The process of adding hydrogen to unsaturated hydrocarbons in the presence of a catalyst like nickel or platinum is called:
8. Which of the following is an example of an isomer of butane (C4H10)?
9. The process of burning a fuel in the presence of a limited supply of air (oxygen) is called:
10. Which allotrope of carbon is used as a lubricant due to its layered structure and weak interlayer forces?
11. What is the general formula for alkynes?
12. The carbon-carbon bond length in diamond is approximately:
13. A hydrocarbon that contains only single bonds between carbon atoms is classified as a(n):
14. The process of heating an organic compound in the absence of air to produce simpler volatile compounds is called:
15. Which functional group is characteristic of alcohols?
16. Buckminsterfullerene, also known as C60, is a molecule composed of 60 carbon atoms arranged in a structure resembling a:
17. The IUPAC name for CH3COOH is:
18. The bonding in diamond is:
19. The process of burning a fuel in an excess of air is known as:
20. Which of the following is a common use of carbon dioxide?
21. The hydrocarbon CH3-CH=CH2 is named:
22. Which element forms the backbone of all organic compounds?
23. The allotrope of carbon that is a lustrous, hard solid and a very poor conductor of electricity is:
24. A compound with the molecular formula C6H14 could be:
25. The functional group -CHO is characteristic of which class of organic compounds?
26. When ethanol (C2H5OH) burns completely in excess oxygen, the products are:
27. What is the common name for ethanoic acid?
28. The carbon cycle describes the movement of carbon atoms between the atmosphere, oceans, land, and living organisms. Which process is a key part of the carbon cycle where carbon dioxide is removed from the atmosphere?
29. The allotrope of carbon that exists as discrete, cage-like molecules is:
30. The functional group -CO- is characteristic of which class of organic compounds?
31. Carbon tetrachloride (CCl4) is a compound of carbon that:
32. Which of the following hydrocarbons is a cycloalkane?
33. The allotrope of carbon that consists of randomly oriented carbon atoms, without a crystalline structure, is called:
34. In the chemical formula CH3CH2OH, the 'CH3CH2-' part represents an:
35. The formation of coal from dead plants over millions of years through geological processes is an example of:
36. The ability of carbon to form long chains, branched chains, and rings is a result of its ability to form strong covalent bonds with itself. This property is known as:
37. Which of the following is a saturated cyclic hydrocarbon with the formula C6H12?
38. The process of producing coke from coal by heating it in the absence of air is called:
39. Which allotrope of carbon is used as an abrasive due to its extreme hardness?
40. What is the IUPAC name for CH3-CO-CH3?
41. The addition of halogens (like bromine) to unsaturated hydrocarbons is an example of:
42. Which of the following is a property of carbon monoxide that makes it dangerous?
43. The term used to describe organic compounds that have the same molecular formula but different structural formulas is:
44. Which of the following is a product of the incomplete combustion of propane (C3H8)?

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