NCERT Solutions For Class 10 Science Chapter 4

NCERT Solutions Class 10 Science Carbon and its Compounds

Ncert Solutions For Class 10 Science Chapter 4 PDF Free Download

NCERT solutions for class 10 science chapter 4 Carbon and its compounds are provided here for students to help them understand the chapter and the topics clearly and to assist their class 10 board examination.

The class 10 science chapter 4 deals with the topic of carbon and its compounds. In this chapter, students get introduced to important topics like properties and nature of carbon, chemical bonding, reactions, acids, etc. The NCERT solutions that we are offering here are designed to help students practice questions and learn all the concepts related to this chapter in an easy manner.

The NCERT class 10 science solutions for chapter 4 given here consists of important solved exercises which students can refer to and avoid the complexities of going through the whole chapter word by word. The solutions include MCQ’s, extra questions, worksheets, exemplar questions and short answering questions. These solutions will further give students an idea about the exam pattern and marking scheme of the paper.

Class 10 science NCERT solutions chapter 4 provided is the perfect study material as it provides a detailed solution for all the questions provided in class 10 Science NCERT textbooks as per CBSE syllabus 2018-19. The NCERT solutions for class 10 students has been solved and reviewed by a specialized team of our subject experts. These solutions are available in a PDF format and students can either study online or download it from our website. NCERT Solutions for Class 10 PDF will help students to understand the concept clearly and study effectively for the board exams.

Subtopics of chapter 4 Carbon and its compounds

  1. Bonding In Carbon- The Covalent Bond
  2. Versatile Nature Of Carbon Ex
    1. Saturated And Unsaturated Carbon Compounds
    2. Chains, Branches And Rings
    3. Will You Be My Friend? E
    4. Homologous Series
    5. Nomenclature Of Carbon Compounds
  3. Chemical Properties Of Carbon Compounds
    1. Combustion
    2. Oxidation
    3. Addition Reaction
    4. Substitution Reaction
  4. Some Important Carbon Compounds – Ethanol And Ethanoic Acid
    1. Properties Of Ethanol
    2. Properties Of Ethanoic Acid
  5. Soaps And Detergents.

Question 1:

Provide the electron dot structure for CO2:




Question 2:

Provide an electron dot structure for a molecule of Sulphur containing eight atoms:




Question 3:

Provide the structural isomers for pentane.




 Question 4:

Describe two properties of carbon and give reasons to why there is a large number of carbon compounds are around us.


  • Carbon has six valence electrons which are actually a high number of valency.
  • Covalent bonding happens easily with carbon atoms and numerous others such as oxygen, chlorine, nitrogen, Sulphur, hydrogen and etc.

Due to these two properties, carbon has a higher number of organic compounds around us.


Question 5:

Provide the electron dot structure and formula for Cyclopentane:




Question 6:

Provide the structures for the compounds provided below:

  1. Butanone
  2. Ethanoic Acid
  3. Hexanal
  4. Bromopentane




Question 7:

Name the following compounds:



  1. Hexane
  2. Formaldehyde
  3. Bromoethane


Question 8:

Give the reason to why the reaction of ethanol to ethanoic acid is an oxidation reaction.



As shown in the reaction: since oxygen is added in this reaction, the change from ethanol to ethanoic acid is known to be an oxidation reaction.


Question 9:

Why is the burnt mixture of oxygen and ethyne used for welding rather than that of ethyne and air?


The production of heat is very important for welding metals. When oxygen and ethyne are burnt, it burns completely and produces a higher temperature than air and ethyne. Oxygen and ethyne produce very hot blue flame but the mixture of air and ethyne gives out a sooty flame which means that there are unburnt particles resulting in lesser heat.


Question 10:

What are the oxidizing agents?



When a substance gains electrons from a redox reaction whilst the oxidation number also reduces, it is known as an oxidizing agent.


Question 11:

Using bond formation of Methyl Chloride (CH3Cl), explain the basis of covalent bonding.



Methyl chloride consists of:

  • One carbon atom
  • Three hydrogen atoms
  • One chlorine atom

The carbon atom, hydrogen atom, chlorine atom has four, one and seven valence electrons respectively where carbon shares four of its valence electrons with the three-hydrogen atoms and one chlorine atom. Therefore, it forms methyl chloride as shown in the chemical equation above.

In the dot structure, it can be seen that there are four shared electrons between carbon and the other atoms. In the reaction, each of the shared pairs is considered as one single covalent bond. Hence, methyl chloride is known to have four single covalent bonds.


Question 12:

Draw the electron dot structure for the following:

  1. Ethanoic acid
  2. H2S
  3. Propanone
  4. F2 




Question 13:

Write down the meaning and explanation of the homologous series.


It is a series of compounds, which has the same functional group. This also contains similar general formula and chemical properties. Since there is a change in the physical properties, we can say that there would be an increase in the molecular size and mass.


Question 14:

Using their physical and chemical properties, differentiate ethanol from ethanoic acid.


Ethanol Ethanoic
Does not react with sodium hydrogencarbonate Bubbles and fizzes with hydrogencarbonate
A good smell Smells like vinegar
No action in litmus paper Blue litmus paper to red
Burning taste Sour taste


 Question 15:

State the reason as to why there is micelle formation when soap is added to water.


The reason for the micelle formation is because of the dirt particles in water and clean water. There are two mediums that are involved: one is pure water and the other being dirt (also called as impurities). The soap also has two mediums: (i) organic tail and (ii) ionic head. So the organic tail mixes and dissolves with the dirt whereas the oil or grease and ionic head dissolves and mixes with the water. Therefore, when the material to be cleaned is removed from the water, the dirt is taken off by the soap molecules in the water. Hence, the soap cleans by forming closed structures by the mutual repulsion of the micelles (positively charged heads).


Question 16:

Explain why carbons and its compounds are used as fuels.


Because carbon and its compounds burn in air and also give out a lot of energy.


Question 17:

Why is scrum produced when hard water is treated with soap?


Scrum is produced from hard water reacting with soap because soap is wasted from reacting with calcium and the magnesium ions from the hard water. This wasted reaction then forms an insoluble precipitate that sticks as a white layer.


Question 18:

What will be the colour change when soap is tested with red litmus paper?


Soap is a base and it will turn red litmus paper to blue.


Question 19:

Define hydrogenation and write about its industrial application.


Hydrogenation is a process or a chemical reaction between hydrogen and other compounds. It is usually done in the presence of catalysts: for example nickel, palladium or platinum. Hydrogenation is used mainly to reduce or saturate organic compounds.


Question 20:

Provide a chemical test that could be used to differentiate between cooking oil and butter. Explain the steps to carry out the test.


The test that could be used is bromine water test.


  • Add little bromine water to cooking oil
  • In a different test tube, add bromine water to butter

If decolorizing happens, then it is considered an unsaturated compound and therefore, it is cooking oil. In addition, the test tube that does not decolourize is considered to be the saturated compound which is the butter.


Question 21:

Can you check if the water is hard using a detergent?


That is not possible because of the formation of lather when detergent is mixed with water.


Question 22:

Why is beating or agitation necessary in order to get clean clothes?


Clothes need to be beaten or agitated so that the soap micelles can trap the oil, grease or any other impurities that have to be removed. When they are being beaten or agitated, the particles are removed from the clothes’ surfaces and go into the water, thus cleaning the clothes.


Question 23:

Explain the process of cleansing action of soap.


There are so many impurities and dirt mixed in water, and most of all those dirt do not dissolve in the water. Soap molecules are a combination of salts such as sodium or potassium. The molecules are of a long chain of carboxylic acids. So, when the carbon chain has dissolved in oil and the ionic end has dissolved in the water, the soap starts cleansing and trapping the dirt. When this happens, the soap molecules form structures that are called micelles. One end of the micelle is used for capturing the oil droplets and then the other end being the ionic faces. This will then form an emulsion in water and help in dissolving the dirt or impurities when the clothes are washed.

The soap molecules have different properties at different ends. The first end being the hydrophilic end which dissolves in the water and is attracted towards the water and the second one being the hydrophobic end which is dissolved in the hydrocarbons and is repulsive to water. The hydrophobic tail aligns itself along the surface of the water because it is not soluble in the water.

Question 23

BYJU’s main goal is to offer students the right learning content and help them succeed in exams. That being said, our solutions have been designed in such a way that it boosts the student’s learning capabilities. However, the NCERT solutions have been thoughtfully put together to help students make the most out of it. The NCERT solutions for class 10 science provided here provides students with a lot of benefits. With easy access, they can practice and revise the different topics anywhere and at any time. Students can further customize their learning experience and they can set their own pace to solve or learn different topics.

And it doesn’t end there, BYJU’s has some of the top subject experts that can help students in their education journey. These teachers can help students learn the subject in a more engaging, easy, detailed and clear manner. Students are given regular feedback regarding their performance and we also have a responsive support team that can clear all the doubts regarding the solutions. Meanwhile, students can also have a glimpse of BYJU’s – The Learning app for an interactive and fun learning experience.

For more information visit BYJU’S website or Download BYJU’S learning app for effective learning.