CBSE Class 10 Science Chemistry Carbon and its compounds Assignment

Read and download free pdf of CBSE Class 10 Science Chemistry Carbon and its compounds Assignment. Get printable school Assignments for Class 10 Chemistry. Standard 10 students should practise questions and answers given here for Chapter 4 Carbon And Its Compound Chemistry in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 10 Chemistry Chapter 4 Carbon And Its Compound

Class 10 Chemistry students should refer to the following printable assignment in Pdf for Chapter 4 Carbon And Its Compound in standard 10. This test paper with questions and answers for Grade 10 Chemistry will be very useful for exams and help you to score good marks

Chapter 4 Carbon And Its Compound Class 10 Chemistry Assignment




Question : What is the unique property of carbon atom? How is this property helpful to us?

Question : Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?

Question : Write the electron dot structure for: 

(a) Ammonia (NH3)

(b) Nitrogen (N2)

(c) Ethyne (C2H2)

(d) Carbon dioxide (CO2)

(e) Benzene (C6H6)

(f) Cyclopentane

Question : The molecular formula of A is C10H18 and B is C18H36.Name the homologous series to which they belong. 

Question : Classify the following compounds as alkanes, alkenes and alkynes.

C2H4 , C3H4 , C4H8 , C5H12 , C5H8 , C3H8


Question : Why carbon forms compounds by sharing of electrons and not by the formation of ions?

Question : State the meaning of functional group.Write the functional group present in (a)Ethanol and(b) Ethanoic acid and also draw their structures.


Important MCQs for NCERT Class 10 Science Carbon and its Compounds


Question : Which of the following structures correctly represents the electron dot structure of a chlorine molecule:

CBSE Class 10 Science Chemistry Carbon and its compounds Assignment

Answer : A

Question : While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
A) The food is not cooked completely
B) The fuel is not burning completely
C) The fuel is wet
D) The fuel is burning completely

Answer :  B

Question : Cation is formed when:
A) Atom gains electrons
B) Atom loses electrons
C) Proton is lost by the atom
D) Atom shares electrons

Answer :  B

Question : The property of self-linkage among identical atoms to form long chain compounds is known as:
A) Catenation
B) Isomerisation
C) Superposition
D) Halogenation

Answer :  A

Question : Which of the following statements about graphite and diamond is true:
A) They have the same crystal structure
B) They have the same degree of hardness
C) They have the same electrical conductivity
D) They can undergo the same chemical reactions

Answer :  D

Question : The byproduct of soap is:
A) Isoprene
B) Glycerol
C) Butane
D) ethylene glycol

Answer :  B

Question : Carbon exists in the atmosphere in the form of:
A) Only carbon monoxide
B) Carbon monoxide in traces and carbon dioxide
C) Only carbon dioxide
D) Coal

Answer :  C

Question : A molecule of ammonia (NH3) has:
A) Only single bonds
B) Only double bonds
C) Only triple bonds
D) Two double bonds and one single bond

Answer :  A

Question : In which of the following compounds -OH is the functional group:
A) Butanone
B) Butanol
C) Butanoic
D) Butanal

Answer :  B

Question : Chlorine reacts with saturated hydrocarbons at room temperature in the:
A) absence of sunlight
B) presence of sunlight
C) presence of water
D) presence of hydrochloric acid

Answer :  B

Question : Hydrocarbon are compounds made of:
A) C & H
B) C & O
C) C & H2O
D) C & He

Answer :  A

Question : Which among the following can react with sodium metal:
A) Ethane
B) Propane
C) Ethanol
D) Ethene

Answer :  C

Question : –CHO Group is:
A) Aldehydic group
B) Alcholic group
C) Ketonic group
D) Acidic Group

Answer :  A

Question : Natural Rubber is a polymer of:
A) Chloroprene
B) Isoprene
C) Propene
D) Neoprene

Answer : B

Question : The number of covalent bonds in C4H10 is:
A) 10
B) 11
C) 12
D) 13

Answer : D


Question : Match the following with the correct response: 
a. 1-D, 2-A, 3-C, 4-B
b. 1-B, 2-D, 3-A, 4-C
c. 1-C, 2-B, 3-D, 4-A
d. 1-A, 2-C, 3-B, 4-D
Answer : D
Explanation: Ionic bonds are formed between cations and anions. Catenation is the linkage of atoms of the same element into longer chains. Catenation occurs most readily in carbon. Pyridine is added to alcohol to make it unsuitable for drinking. Most of the synthetic detergents are nonbiodegradable. They cannot be decomposed by micro-organisms like the bacteria. 
Question : Hydrocarbon with molecular formula has: 
a. 10 covalent bonds
b. 7 covalent bonds
c. 13 covalent bonds
d. 6 covalent bonds
Answer : C
Explanation: Butane C4H10 has 3 C-C covalent bonds and 10 C-H covalent bonds. Thus, it has 13 covalent bonds. 
Question : The structural formula of an ester from which an acid and an alcohol is formed is as follows. Name the acid and the alcohol. 
a. Formic acid, Ethanol
b. Ethanoic acid, Ethanol
c. Propanoic acid, Methanol
d. Formic acid, Propanol
Answer : D
Explanation: HCOOCH2CH2CH3 + H2O --> HCOOH + CH3 CH2CH2OH
The ester is HCOOCH2CH2CH3. The product HCOOH is formic acid or methanoic acid (carboxylic acid) and CH3CH2CH2OH is propanol (alcohol).
Question : The functional group present in ethanol is: 
a. Carboxyl group
b. Ester group
c. Alcoholic group
d. Aldehydic group
Answer : C
Explanation: The functional group present in ethanol (C2H5OH) is the alcoholic group (-OH group). The hydroxyl group attached to a carbon atom is known as alcohol group. 

Very Short Answers 

Question : Name the organic acid present in red ants. 
Answer : The acid produced by ants is called formic acid.   
Question : Name the functional groups present in the following compounds.
iv. CH3CH2OH
Answer : i. The functional group present in given compound is Ketone,
ii. The functional group present in given compound is Carboxylic acid, -COOH
iii. The functional group present in given compound is Aldehyde, -CHO
iv. The functional group present in given compound is Alcohol, -OH
Question : What is the common name of ethanoic acid? How ethanoic acid is different from vinegar? Give the use of vinegar in our daily life. 
Answer :  Ethanoic acid (CH3COOH) is commonly known as acetic acid. The dilute solution of acetic acid in water (6-8%) is known as vinegar. The vinegar is used for preserving food sausage, pickles, etc. 
Question : What are the various ways in which an atom can achieve the noble gas configurations? 
Answer : An atom can achieve the noble gas configurations by transfer of electrons to/from the other atom(s) or by sharing of electrons with other atom(s).

Short Answers

Question : Explain giving chemical equation, how are esters prepared? Specify any one property and one use of esters. 
Answer :  Ethyl ethanoate which is a ester of ethanoic acid and ethanol.
The process is called esterification.
Question : Name the following compounds. 










Answer : i. Propanone (CH3COCH3)
ii. Butanal (C3H7CHO)
iii. Methanoic acid (HCOOH)
Question : Why is the conversion of ethanol to ethanoic acid an oxidation reaction? 
Answer :  During the conversion of ethanol to ethanoic acid 1 oxygen atom is added to the ethanol to convert ethanoic acid. Addition of oxygen is nothing but oxidation. Hence, the conversion of ethanol to ethanoic acid called an oxidation reaction.
Question : An aldehyde as well as a ketone can be represented by the same molecular formula, say C3H6O. Write their structures and name them. State the relation between the two in the language of science. 


Answer :   An aldehyde as well as a ketone both are different functional groups and can be represented by the same molecular formula, say C3H6O.
Their structures are as follows:




Such compounds with identical molecular formula but different structures are called structural isomers. Where number of atoms of each type remain same only the arrangement changes. 

Question. What is a homologous series? Explain with an example.
Answer : A homologous series can be defined as a family of organic compounds having the same functional group, similar chemical properties and the successive members of which
differ by a – CH2 group or 14 mass units. For example, CH3OH (methanol), CH3CH2OH (ethanol), CH3CH2CH2OH (propanol), CH3CH2CH2CH2OH (butanol), etc. constitute a homologous series of alcohols. They have the same functional group, i.e., —OH (hydroxyl). Since they have the same functional group, they show similar chemical properties. The difference between any two successive members is a —CH2 group and 14 mass units. Their physical properties such as melting point and boiling point increase as the molecular mass increases. Their solubility in water, however, decreases with increase in molecular mass.

Question. What are covalent bonds? Show their formation with the help of electron dot structure of methane. Why are covalent compounds generally poor conductors of electricity?
Answer : Covalent bonds are those bonds which are formed by sharing the valence electrons between two atoms. Electron dot structure of methane is shown in the figure. Covalent compounds are generally poor conductors of electricity because they do not have free electrons or ions.

Question. Taking a suitable example show the formation of a molecule bonded by triple covalent bond.
Answer : Nitrogen (atomic number 7) atom has an electronic configuration of K L 2 5 indicating the presence of 5 electrons in the outermost L-shell. Thus, each nitrogen atom needs three electrons to attain the nearest stable noble gas electronic configuration of neon gas. So, two nitrogen atoms combine together by sharing 3 electrons each to form a molecule of nitrogen.

Question. Why are most carbon compounds poor conductors of electricity?
Answer : Due to catenation, carbon forms covalent bonds with the constituent elements in the carbon compounds, hence it does not have mobile electrons and carbon compounds do not dissociate themselves into ions and hence, they are poor conductor of electricity.

Question. What are covalent compounds? Why are they different from ionic compounds? List their three characteristic properties.
Answer : Covalent compounds are those compounds which are formed by sharing of valence electrons between the atoms e.g., Hydrogen molecule is formed by mutual sharing of electrons between two hydrogen atoms. They are different from ionic compounds as ionic compounds are formed by the complete transfer of electrons from one atom to another e.g., NaCl is formed when one valence electron of sodium gets completely transferred to outer shell of chlorine atom. The characteristic properties of covalent compounds are :
(i) They are generally insoluble or less soluble in water but soluble in organic solvents.
(ii) They have low melting and boiling points.
(iii) They do not conduct electricity as they do not contain ions.

Question. Why are carbon and its compounds used as fuels for most applications?
Answer : Carbon burns in oxygen or air to form carbon dioxide gas. The reaction is highly exothermic. That is why different forms of coal are used as fuels. The most important compounds of carbon are hydrocarbons. Just like carbon, hydrogen also readily burns in oxygen or air to form water producing heat. The hydroca rbon methane (CH4) is a constituent of natural gas. Propane (C3H8) and butane (C4H10) are present in liquid petroleum gas (L.P.G.). Petrol and kerosene also contain different hydrocarbons. Therefore, these are used as fuels.

Question. What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint : The eight atoms of sulphur are joined together in the form of a ring).
Answer : The atomic number (Z) of sulphur is sixteen and its electronic configuration is 2, 8, 6. The sulphur atom has six valence electrons. The chemical formula of sulphur molecule
is S8. Each sulphur atom is linked to similar atoms on either sides by single covalent bonds and thus, completes its octet.
The molecule is in the form of a ring also represented by crown shape.

Question. What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
Answer : (i) Catenation : Carbon has the unique property of self linking which is known as catenation. In fact, any number of carbon atoms can be linked to one another by covalent
bonds. This is on account of the stability of C — C bonds since the size of the carbon atom is quite small.
(ii) Linking of carbon with other atoms : Carbon is tetravalent in nature and can readily unite with atoms like hydrogen, oxygen, nitrogen, sulphur, etc. by electron sharing.

Question. Consider the molecular models of the two organic compounds shown below: 
CBSE Class 10 Science Chemistry Carbon and its compounds Assignment
(a) Name the homologous series that compounds I and II belong to and give its general formula.
(b) Write the molecular formulae of next homologue of both compounds I and II.
Answer : (a) Alkenes with general formula CnH2n.
(b) Next homologue of compound (I) is C3H6 i.e., propene and next homologue of compound (II) is C5H10 i.e., pentene.


Long Answers

Question : Name the following compounds. 
Answer :  According to the question, Given compounds are




Question : What are alcohols? What is its general formula? Give the names and molecular formula of first three members of the homologous series of alcohols. 
Answer : The organic compounds containing the hydroxyl or alcoholic group (–OH) as the functional group are called alcohols. These are obtained by replacing one hydrogen atom of an alkane by –OH group. For example,


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