SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions | Assam Eduverse

Q: How many MCQs are asked in HSLC Science exam?

Students must answer 45 MCQs as per the latest HSLC exam pattern.

Q: Are MCQs included in Chapter 4 important questions?

Yes, conceptual MCQs are included according to the latest HSLC structure.

Q: Are these questions based on SEBA syllabus?

Yes, all questions follow the latest SEBA (ASSEB) syllabus for 2026–27.

Q: Do these include previous year questions?

Yes, previous year questions are included to match HSLC exam trends.

Q: Can practising these improve exam performance?

Yes, regular revision improves conceptual clarity and MCQ accuracy.

SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions are prepared to strengthen understanding of carbon compounds for the HSLC examination. These SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions include theory-based questions, reaction-based questions, previous year questions (PYQs), and important MCQs.

The SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions strictly follow the latest SEBA (ASSEB) syllabus for 2026–27. Since the HSLC examination requires students to attempt 45 MCQs, practising MCQs from SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions is essential.

Topics covered in SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions include covalent bonding, homologous series, functional groups, ethanol, ethanoic acid, properties of carbon compounds, soaps and detergents. Students searching for HSLC Science Chapter 4 Carbon and Its Compounds Important Questions or SEBA Class 10 Science Chapter 4 PYQs will find this resource highly useful.

SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Questions with PYQs and MCQs

A. Previous Year Questions with Answers

Q1. A molecule of propane has [HSLC 2015]
(a) 10 covalent bonds
(b) 9 covalent bonds
(c) 8 covalent bonds
(d) 11 covalent bonds
Answer: (a)

Q2. What can be the maximum number of sulphur atoms present in a molecule? [HSLC 2024]
(A) 2
(B) 4
(C) 8
(D) 10
Answer: (C) 8

Q3. The name of a compound containing three carbons and aldehyde as functional group is [HSLC 2024]
(A) propene
(B) propanol
(C) propane
(D) propanal
Answer: (D) propanal

Q4. Which of the following statements is true for an oxidizing agent? [HSLC 2024]
(A) It gives hydrogen
(B) It gives oxygen
(C) It takes oxygen
(D) None of the above
Answer: (B) It gives oxygen

B. Extra Questions with Answers

Q.1 The melting and boiling points of most carbon compounds are generally low because —
(a) they contain ions
(b) they are metallic in nature
(c) the forces of attraction between their molecules are weak
(d) they conduct electricity
Answer: (c) the forces of attraction between their molecules are weak

Q.2 Carbon overcomes the problem of gaining or losing four electrons by —
(a) forming C⁴⁺ ion
(b) forming C⁴⁻ ion
(c) sharing its valence electrons with other atoms
(d) remaining unreactive
Answer: (c) sharing its valence electrons with other atoms

Q.3 In methane (CH₄), carbon is said to be tetravalent because —
(a) it forms four ionic bonds
(b) it shares four electrons with four hydrogen atoms
(c) it gains four electrons
(d) it loses four electrons
Answer: (b) it shares four electrons with four hydrogen atoms

Q.4 Which of the following is an unsaturated hydrocarbon?
(a) C₂H₆
(b) C₃H₈
(c) C₂H₄
(d) CH₄
Answer: (c) C₂H₄

Q.5 Each successive member of a homologous series differs from the previous one by —
(a) –CH₃
(b) –CH₂–
(c) –CH–
(d) –C₂H₂–
Answer: (b) –CH₂–

Q.6 Assertion (A): Diamond is the hardest known substance.
Reason (R): In diamond, each carbon atom is bonded to four other carbon atoms forming a rigid three-dimensional structure.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.7 During burning of unsaturated hydrocarbons in limited supply of air, a yellow sooty flame is produced because —
(a) complete combustion occurs
(b) carbon particles remain unburnt
(c) excess oxygen is present
(d) water vapour is formed
Answer: (b) carbon particles remain unburnt

Q.8 Match the following :

(a) A–2, B–3, C–1, D–4
(b) A–1, B–2, C–3, D–4
(c) A–2, B–1, C–4, D–3
(d) A–3, B–2, C–1, D–4
Answer: (a) A–2, B–3, C–1, D–4

Q.9 When ethanol is heated with excess concentrated sulphuric acid at 443 K, the product formed is —
(a) ethane
(b) ethene
(c) ethanoic acid
(d) methane
Answer: (b) ethene

Q.10 Which of the following reactions is an example of substitution reaction?
(a) Addition of hydrogen to ethene
(b) Reaction of ethanoic acid with sodium carbonate
(c) Reaction of methane with chlorine in the presence of sunlight
(d) Oxidation of ethanol to ethanoic acid
Answer: (c) Reaction of methane with chlorine in the presence of sunlight

Q.11 The property of carbon by which it forms long chains, branched chains or rings with other carbon atoms is called —
(a) tetravalency
(b) catenation
(c) allotropy
(d) polymerisation
Answer: (b) catenation

Q.12 Which of the following statements about graphite is correct?
(a) Each carbon atom is bonded to four other carbon atoms
(b) It is the hardest natural substance
(c) It is a good conductor of electricity
(d) It has a three-dimensional rigid structure
Answer: (c) It is a good conductor of electricity

Q.13 Structural isomers are compounds which have —
(a) different molecular formula and different structures
(b) same molecular formula but different structures
(c) same structural formula but different molecular formula
(d) same physical and chemical properties in all respects
Answer: (b) same molecular formula but different structures

Q.14 Assertion (A): Saturated hydrocarbons generally burn with a clean blue flame.
Reason (R): They undergo complete combustion in sufficient supply of air.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.15 The general formula of alkenes is —
(a) CₙH₂ₙ₊₂
(b) CₙH₂ₙ
(c) CₙH₂ₙ₋₂
(d) CₙH₂ₙ₊₁
Answer: (b) CₙH₂ₙ

Q.16 When ethanoic acid reacts with sodium hydrogencarbonate, the gas evolved is —
(a) hydrogen
(b) oxygen
(c) carbon dioxide
(d) nitrogen
Answer: (c) carbon dioxide

Q.17 Match the following :

(a) A–3, B–1, C–2, D–4
(b) A–1, B–3, C–4, D–2
(c) A–3, B–2, C–1, D–4
(d) A–4, B–1, C–2, D–3
Answer: (a) A–3, B–1, C–2, D–4

Q.18 In the cleaning action of soap, the hydrophobic end of the soap molecule —
(a) dissolves in water
(b) dissolves in oil or grease
(c) forms hydrogen gas
(d) reacts with hard water ions
Answer: (b) dissolves in oil or grease

Q.19 Assertion (A): Ethanoic acid is a weak acid.
Reason (R): It is completely ionised in aqueous solution.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (c) A is true but R is false

Q.20 When soap solution is added to hard water, a white curdy precipitate is formed due to the reaction of soap with —
(a) sodium ions
(b) potassium ions
(c) calcium and magnesium ions
(d) chloride ions
Answer: (c) calcium and magnesium ions

Q.21 Which of the following is an allotrope of carbon?
(a) Marble
(b) Diamond
(c) Limestone
(d) Gypsum
Answer: (b) Diamond

Q.22 In ethene (C₂H₄), the bond between the two carbon atoms is —
(a) single bond
(b) double bond
(c) triple bond
(d) ionic bond
Answer: (b) double bond

Q.23 The catalyst used in the hydrogenation of vegetable oils is —
(a) Iron
(b) Copper
(c) Nickel
(d) Zinc
Answer: (c) Nickel

Q.24 Which of the following compounds belongs to the homologous series of alcohols?
(a) CH₃OH
(b) CH₃COOH
(c) C₂H₄
(d) C₂H₂
Answer: (a) CH₃OH

Q.25 Assertion (A): Covalent compounds are generally poor conductors of electricity.
Reason (R): Covalent compounds do not form ions in solution.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.26 During the reaction of ethanol with sodium metal, which gas is evolved?
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Nitrogen
Answer: (b) Hydrogen

Q.27 Match the following :

(a) A–3, B–4, C–1, D–2
(b) A–4, B–3, C–1, D–2
(c) A–1, B–3, C–4, D–2
(d) A–2, B–4, C–3, D–1
Answer: (b) A–4, B–3, C–1, D–2

Q.28 The sweet smell produced during the reaction of ethanoic acid with ethanol in the presence of concentrated sulphuric acid is due to the formation of —
(a) alcohol
(b) aldehyde
(c) ester
(d) ketone
Answer: (c) ester

Q.29 Which of the following hydrocarbons will undergo addition reaction?
(a) C₂H₆
(b) C₃H₈
(c) CH₄
(d) C₂H₂
Answer: (d) C₂H₂

Q.30 In the micelle formed by soap molecules in water, the ionic ends are directed towards —
(a) oil droplets
(b) the centre of micelle
(c) water
(d) hydrocarbon chain
Answer: (c) water

Q.31 Carbon has atomic number 6. The number of valence electrons present in a carbon atom is —
(a) 2
(b) 3
(c) 4
(d) 6
Answer: (c) 4

Q.32 Which of the following compounds will give a yellow sooty flame on burning in air?
(a) Methane
(b) Ethane
(c) Ethene
(d) Propane
Answer: (c) Ethene

Q.33 When alkaline potassium permanganate is added to warm ethanol, the colour of potassium permanganate disappears because ethanol is —
(a) reduced
(b) oxidised to ethanoic acid
(c) converted to ethene
(d) neutralised
Answer: (b) oxidised to ethanoic acid

Q.34 The compound with functional group –COOH belongs to the class of —
(a) alcohols
(b) aldehydes
(c) ketones
(d) carboxylic acids
Answer: (d) carboxylic acids

Q.35 Assertion (A): Ethanoic acid reacts with sodium carbonate to produce brisk effervescence.
Reason (R): Carbon dioxide gas is liberated during the reaction.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.36 Which of the following represents the general formula of alkynes?
(a) CₙH₂ₙ₊₂
(b) CₙH₂ₙ
(c) CₙH₂ₙ₋₂
(d) CₙH₂ₙ₊₁
Answer: (c) CₙH₂ₙ₋₂

Q.37 Match the following :

(a) A–2, B–1, C–3, D–4
(b) A–1, B–2, C–4, D–3
(c) A–3, B–4, C–1, D–2
(d) A–2, B–3, C–1, D–4
Answer: (a) A–2, B–1, C–3, D–4

Q.38 The functional group that gives characteristic properties to alcohols is —
(a) –COOH
(b) –CHO
(c) –OH
(d) –CO–
Answer: (c) –OH

Q.39 In diamond, each carbon atom is bonded to —
(a) one other carbon atom
(b) two other carbon atoms
(c) three other carbon atoms
(d) four other carbon atoms
Answer: (d) four other carbon atoms

Q.40 When soap solution is added to distilled water and shaken, —
(a) no foam is formed
(b) very little foam is formed
(c) abundant foam is formed
(d) a curdy precipitate is formed
Answer: (c) abundant foam is formed

Q.41 The name of the four-carbon compound containing a ketone functional group is —
(a) Butanal
(b) Butanol
(c) Butanone
(d) Butanoic acid
Answer: (c) Butanone

Q.42 Which of the following compounds is a member of the alkane homologous series?
(a) C₃H₆
(b) C₂H₂
(c) C₄H₁₀
(d) C₂H₄
Answer: (c) C₄H₁₀

Q.43 Assertion (A): Soaps are not effective in hard water.
Reason (R): Soap forms insoluble precipitates with calcium and magnesium ions present in hard water.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.44 The common name of ethanoic acid is —
(a) Formic acid
(b) Acetic acid
(c) Citric acid
(d) Lactic acid
Answer: (b) Acetic acid

Q.45 During esterification, ethanoic acid reacts with ethanol in the presence of —
(a) dilute hydrochloric acid
(b) sodium hydroxide
(c) concentrated sulphuric acid
(d) nickel
Answer: (c) concentrated sulphuric acid

Q.46 Match the following :

(a) A–2, B–1, C–3, D–4
(b) A–1, B–2, C–4, D–3
(c) A–3, B–4, C–2, D–1
(d) A–4, B–3, C–1, D–2
Answer: (a) A–2, B–1, C–3, D–4

Q.47 The reaction in which hydrogen is added to an unsaturated hydrocarbon in the presence of a catalyst is called —
(a) substitution
(b) esterification
(c) hydrogenation
(d) neutralisation
Answer: (c) hydrogenation

Q.48 Which of the following compounds will react with sodium to liberate hydrogen gas?
(a) Ethene
(b) Ethanol
(c) Methane
(d) Benzene
Answer: (b) Ethanol

Q.49 The cloudy appearance of soap solution is due to —
(a) formation of carbon dioxide
(b) presence of insoluble salt
(c) scattering of light by micelles
(d) evaporation of water
Answer: (c) scattering of light by micelles

Q.50 The two properties of carbon responsible for the formation of a large number of carbon compounds are —
(a) allotropy and conductivity
(b) tetravalency and catenation
(c) low melting point and low boiling point
(d) high reactivity and metallic nature
Answer: (b) tetravalency and catenation

Q.51 The electron dot structure of oxygen molecule (O₂) shows —
(a) one shared pair of electrons
(b) two shared pairs of electrons
(c) three shared pairs of electrons
(d) four shared pairs of electrons
Answer: (b) two shared pairs of electrons

Q.52 In nitrogen molecule (N₂), the two nitrogen atoms are joined by —
(a) single bond
(b) double bond
(c) triple bond
(d) ionic bond
Answer: (c) triple bond

Q.53 Assertion (A): Carbon compounds are generally poor conductors of electricity.
Reason (R): They do not produce free ions in solution.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.54 Which of the following compounds contains only single bonds between carbon atoms?
(a) Ethyne
(b) Ethene
(c) Propane
(d) Benzene
Answer: (c) Propane

Q.55 When ethanol is oxidised using alkaline potassium permanganate, the product formed is —
(a) ethene
(b) ethanoic acid
(c) methane
(d) acetone
Answer: (b) ethanoic acid

Q.56 Match the following :

(a) A–3, B–1, C–2, D–4
(b) A–1, B–3, C–2, D–4
(c) A–2, B–1, C–3, D–4
(d) A–3, B–2, C–1, D–4
Answer: (a) A–3, B–1, C–2, D–4

Q.57 The reaction of ethanoic acid with sodium hydroxide is an example of —
(a) addition reaction
(b) substitution reaction
(c) neutralisation reaction
(d) hydrogenation
Answer: (c) neutralisation reaction

Q.58 The structure of graphite consists of carbon atoms arranged in —
(a) tetrahedral structure
(b) hexagonal layers
(c) cubic structure
(d) linear chains only
Answer: (b) hexagonal layers

Q.59 Assertion (A): Oils are converted into fats during hydrogenation.
Reason (R): Hydrogen is added to unsaturated carbon chains in the presence of a catalyst.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer: (a) Both A and R are true and R is the correct explanation of A

Q.60 The gas evolved when ethanol reacts with sodium metal can be tested by —
(a) lime water turning milky
(b) burning with a pop sound
(c) turning red litmus blue
(d) producing brown fumes
Answer: (b) burning with a pop sound

SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions for HSLC Exam 2026–27

The SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions provided here are designed according to the latest SEBA (ASSEB) syllabus 2026–27. These SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions include conceptual MCQs, short answers, long answers, and reaction-based questions aligned with the HSLC exam pattern.

As per the updated HSLC structure, students must attempt 45 MCQs. Therefore, regular practice of SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions ensures better preparation for MCQ-based and reasoning-type questions.

The SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions cover bonding in carbon, versatile nature of carbon, homologous series, functional groups, properties of ethanol and ethanoic acid, and cleansing action of soaps. Continuous revision using SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions improves conceptual accuracy.

These Class 10 Carbon and Its Compounds Important Questions with MCQs are ideal for final revision. Consistent practice of SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions strengthens exam confidence and scoring ability.

Frequently Asked Questions (FAQ)

1. Why is Chapter 4 Carbon and Its Compounds important for HSLC exam?

Chapter 4 explains bonding in carbon, homologous series, functional groups, ethanol, ethanoic acid, and soaps which are frequently asked in HSLC exams.

2. How many MCQs are asked in HSLC Science exam?

As per the latest HSLC exam pattern, students must answer 45 MCQs in the Science examination.

3. Are MCQs included in Chapter 4 important questions?

Yes, important conceptual MCQs are included according to the latest HSLC structure.

4. Are these questions based on SEBA syllabus?

Yes, all SEBA Class 10 Science Chapter 4 Carbon and Its Compounds Important Extra Questions are prepared strictly according to the SEBA (ASSEB) syllabus.

5. Do these include previous year questions?

Yes, previous year questions are included to help students understand exam patterns.

6. Which topics are covered in Chapter 4?

Topics include covalent bonding, homologous series, functional groups, ethanol, ethanoic acid, and cleansing action of soaps.

7. Can practising these improve exam performance?

Yes, regular revision improves conceptual clarity, MCQ accuracy, and exam confidence.

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Class 10 Chapter 4 Carbon and Its Compounds PYQs