NCERT Class 10 Science Science: Chapter 4 — Carbon and its Compounds
This chapter introduces students to Carbon and its Compounds, a crucial topic in Class 10 Science. It begins by highlighting the ubiquitous nature of carbon compounds in everyday life, from food and clothing to medicines and living structures. The chapter emphasizes carbon's unique versatility despite its low abundance in the Earth's crust and atmosphere. It then delves into the nature of bonding in carbon compounds, explaining why they are generally poor conductors of electricity and have low melting and boiling points compared to ionic compounds. The concept of covalent bonding, where carbon shares its four valence electrons to achieve a stable noble gas configuration, is introduced as the primary mechanism for forming carbon compounds. The chapter sets the stage for exploring various properties and reactions of carbon and its diverse compounds.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 10 |
| Subject | Science |
| Book | Science |
| Chapter | Chapter 4 — Carbon and its Compounds |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 5 minutes |
| Word count | 859 |
Learning outcomes
- Understand the importance of carbon as a versatile element.
- Recognize that most everyday substances are carbon-based compounds.
- Learn about the properties of carbon compounds, such as poor electrical conductivity and low melting/boiling points.
- Grasp the concept of covalent bonding as the primary mode of bonding in carbon compounds.
- Understand why carbon forms covalent bonds by sharing its valence electrons.
Vocabulary
| Word | Meaning |
|---|---|
| Carbon | An element with atomic number 6, known for its ability to form a vast number of compounds. |
| Compounds | Substances formed when two or more chemical elements are chemically bonded together. |
| Minerals | Naturally occurring solid chemical substances formed through geological processes. |
| Petroleum | A naturally occurring yellowish-black liquid found beneath the Earth's surface, which is a mixture of hydrocarbons. |
| Ionic compounds | Chemical compounds formed by electrostatic forces of attraction between oppositely charged ions. |
| Valence electrons | Electrons in the outermost shell of an atom that can participate in chemical bonding. |
| Noble gas configuration | The stable electron configuration of noble gases, typically having a full outer electron shell. |
| Cation | A positively charged ion formed by losing electrons. |
| Anion | A negatively charged ion formed by gaining electrons. |
| Covalent bond | A chemical bond that involves the sharing of electron pairs between atoms. |
| Methane | A simple hydrocarbon (CH4) and the primary component of natural gas. |
| Hydrogen | The lightest chemical element (H), with atomic number 1. |
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Practice questions
- Why are most carbon compounds poor conductors of electricity? Answer: Most carbon compounds are poor conductors of electricity because they do not form ions; they are held together by covalent bonds where electrons are shared, not transferred.
- What is the atomic number of carbon and how many valence electrons does it have? Answer: The atomic number of carbon is 6. It has 4 valence electrons in its outermost shell.
- Explain why carbon cannot form C4+ or C4- ions easily. Answer: Carbon cannot form C4+ ions easily because it would require a large amount of energy to remove four electrons. It cannot form C4- ions easily because the nucleus with six protons would struggle to hold onto ten electrons.
- What is covalent bonding? Answer: Covalent bonding is a type of chemical bond that involves the sharing of electron pairs between atoms to achieve a stable electron configuration.
- Give an example of a simple molecule formed by covalent bonding. Answer: An example of a simple molecule formed by covalent bonding is hydrogen (H2), where two hydrogen atoms share their electrons.
Frequently asked questions
What is the main reason for the importance of carbon?
Carbon is important due to its unique ability to form a vast number of compounds by bonding with itself and other elements, forming the basis of all living structures.
How much carbon is present in the Earth's crust and atmosphere?
The Earth's crust has only 0.02% carbon in minerals, and the atmosphere has 0.03% carbon dioxide.
Are carbon compounds good conductors of electricity?
No, most carbon compounds are poor conductors of electricity because they do not form ions.
Do carbon compounds have high or low melting and boiling points?
Compared to ionic compounds, most carbon compounds have low melting and boiling points.
How does carbon achieve a stable electron configuration?
Carbon achieves a stable electron configuration by sharing its four valence electrons with other atoms, forming covalent bonds.
What is the atomic number of carbon?
The atomic number of carbon is 6.
What is the simplest molecule formed by sharing electrons?
The simplest molecule formed by sharing electrons is hydrogen (H2).
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NCERT Class 10 Science — Science — Chapter 4 — Carbon and its Compounds. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.