Class 10 Science Chapter 4 MCQ (Multiple Choice Questions) of Carbon and its Compounds. These MCQs contains all the important questions from latest NCERT textbooks and are useful for all the students following NCERT Books.

Answers and explanation of each question is given below along with the questions. There are about 110 questions divided into sets of MCQ online tests.

Class 10 Science Chapter 4 MCQ for 2021-2022

Class: 10Science
Chapter: 4Multiple Choice Questions (MCQ) Tests

Class 10 Science Chapter 4 MCQ with Answers

Class 10 Science Chapter 4 MCQ Online tests practice with answers and explanation. Practice here to prepare your school test and board papers. Questions are taken form NCERT Books and answers are also confined to NCERT textbooks only.

Q1

The first member of alkyne homologous series is:

[A]. Ethyne
[B]. Ethene
[C]. Propyne
[D]. Methane
Q2

Priya is writing some statements, choose the incorrect statement and help him:

[A]. A carbon atom has 4 electrons in its outermost shell.
[B]. Carbon atoms can achieve the inert gas electron arrangement only by the sharing of electrons, therefore, carbon always forms covalent bonds.
[C]. One carbon atom requires 8 electrons to achieve the eight-electron inert gas structure, therefore, the valency of carbon is 6.
[D]. None of the above.
Q3

Which of the following represents saponification reaction?

[A]. CH3COONa + NaOH + CaO → CH4 + Na2CO3
[B]. CH3COOH + C2H5OH + H2SO4 → CH3COOC2H5 +H2O
[C]. 2CH3COOH + 2Na → 2CH3COONa + H2
[D]. CH3COOC2H5 + NaOH → CH3COONa + C2H5OH
Q4

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. If we burn graphite in oxygen, then only carbon dioxide gas is formed and nothing is left behind
[B]. Graphite does not conduct electricity.
[C]. The various physical forms in which an element can exist are called allotropes of the element.
[D]. Diamond is a colourless transparent substance having extraordinary brilliance.
Q5

Which of the following statement is or are correct?

[A]. Each carbon atom in a graphite layer is joined to three other carbon atoms by strong covalent bonds to form flat hexagonal rings.
[B]. The various layers of carbon atoms in graphite are joined by weak forces, they can slide over one another.
[C]. Due to the presence of free electrons in a graphite crystal, it conducts electricity.
[D]. All the above.




Q6

Read the following sentences carefully, and choose the incorrect one:

[A]. Graphite is non-volatile, so, it can-not be used for lubricating.
[B]. Graphite is used for making carbon electrodes or graphite electrodes in dry cells and electric arcs.
[C]. Diamonds can be made artificially by subjecting pure carbon to very high pressure and temperature.
[D]. Diamond “dies” are used for drawing thin wires like the tungsten filament of an electric bulb.
Q7

Ethanol reacts with sodium and forms two products. These are

[A]. Sodium ethanoate and hydrogen
[B]. Sodium ethanoate and oxygen
[C]. Sodium ethoxide and hydrogen
[D]. Sodium ethoxide and oxygen
Q8

Which of the following statement is or are incorrect?

[A]. The compounds of carbon are known as organic compounds.
[B]. Although oxides of carbon (like carbon monoxide and carbon dioxide), carbonates, hydrogen carbonates and carbides are also carbon compounds and they are considered to be organic compounds.
[C]. Most of the carbon compounds are non-conductors of electricity.
[D]. Carbon compounds (or organic compounds) are covalent compounds having low melting points and boiling points.
Q9

Pentane has the molecular formula C5H12. It has

[A]. 5 covalent bonds
[B]. 12 covalent bonds
[C]. 16 covalent bonds
[D]. 17 covalent bonds
Q10

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. A compound made up of hydrogen and carbon only is called hydrocarbon.
[B]. The property of carbon element due to which its atoms can join with one another to form long carbon chains is called “carbonization”.
[C]. The study of carbon compounds (such as hydrocarbons and their derivatives) is called organic chemistry
[D]. None of the above.




Q11

Which of the following statement is or are incorrect?

[A]. The general formula of alkynes is CH2n +2 where n is the number of carbon atoms in one molecule of the alkyne.
[B]. The unsaturated hydrocarbons are obtained mostly from petroleum by a process called cracking.
[C]. An unsaturated hydrocarbon in which the two carbon atoms are connected by a double bond is called an alkene.
[D]. The simplest alkene is ethene having the molecular formula C2H4.
Q12

Identify the unsaturated compounds from the following:

[A]. Propane, Propene
[B]. Propene, Chloropropane
[C]. Propyne, Chloropropane
[D]. Propene, Propyne
Q13

The soap molecule has a

[A]. Hydrophilic head and a hydrophobic tail
[B]. Hydrophobic head and a hydrophilic tail
[C]. Hydrophobic head and a hydrophobic tail
[D]. Hydrophilic head and a hydrophilic tail
Q14

Bikash is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. The ethene molecule (C2H4) is made up of 2 carbon atoms and 4 hydrogen atoms.
[B]. Each carbon atom shares three electrons with three hydrogen atoms to form three carbon-hydrogen single covalent bonds.
[C]. In ethane, the two carbon atoms share one pair of electrons among themselves to form one carbon-carbon single covalent bond.
[D]. All the above.
Q15

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of:

[A]. Addition reaction
[B]. Substitution reaction
[C]. Displacement reaction
[D]. Oxidation reaction



Q16

Consider the following statements and choose the correct one:

[A]. The group formed by the removal of one hydrogen atom from an alkane molecule is called an alkyl group.
[B]. An unsaturated hydrocarbon in which the two carbon atoms are connected by a triple bond is called an alkyne.
[C]. An unsaturated hydrocarbon in which the two carbon atoms are connected by a double bond is called an alkene.
[D]. All the above.
Q17

CH3 – CH2 – OH + Alkaline KMnO4 + Heat → CH3 – COOH. In the above given reaction, alkaline KMnO4 acts as

[A]. Reducing agent
[B]. Oxidising agent
[C]. Catalyst
[D]. Dehydrating agent
Q18

Read the following sentences carefully, and choose the incorrect one:

[A]. Normal-butane has a straight chain structure whereas iso-butane has a branched chain structure.
[B]. All the members of a homologous series can be represented by the different formula.
[C]. Isomerism is possible only with hydrocarbons having 4 or more carbon atoms.
[D]. The organic compounds having the same molecular formula but different structures are known as isomers.
Q19

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
Q20

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Any two adjacent homologous differ by 1 carbon atom and 2 hydrogen atoms in their molecular Formulae.
[B]. The difference in the molecular masses of any two adjacent homologous is 16 u.
[C]. All the compounds of a homologous series show similar chemical properties.
[D]. The members of a homologous series show a gradual change in their physical properties with increase in molecular mass.



Q21

Which of the following statements are usually correct for carbon compounds? These

[A]. are good conductors of electricity, have strong forces of attraction between their molecules.
[B]. are poor conductors of electricity, have strong forces of attraction between their molecules.
[C]. are good conductors of electricity, do not have strong forces of attraction between their molecule.
[D]. are poor conductors of electricity, do not have strong forces of attraction between their molecules.
Q22

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
Q23

In a science quiz competition, Priyanka are asked a question where she had to choose the statement which was/were incorrect?

[A]. The IUPAC name of the compound CH3COCH2CH2CH3 is pentanone.
[B]. The IUPAC name of the compound CH3COCH2CH3 is butanone.
[C]. The IUPAC name of CH3COCH3 is propanone
[D]. The common name of pentanone is ethyl methyl ketone.
Q24

Consider the following statements and choose the incorrect one:

[A]. The simplest ketone is acetone, CH3COCH3, which is also known as propanone.
[B]. The common name of propanal (CH3CH2CHO) is propionaldehyde.
[C]. Ethanal (CH3CHO) contains 2 carbon atoms, so its parent hydrocarbon is ethane.
[D]. None of the above.
Q25

In which of the following, 14 u, will be the differences in the molecular formulae and molecular masses:

[A]. CH3OH and C2H5OH
[B]. C2H5OH and C3H7OH
[C]. C3H7OH and C4H9OH
[D]. All of the above



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Why does Carbon not form an ionic bonds?

There are two main reasons for not forming an ionic bonds.

    • It could gain four electrons forming C4– anion. But it would be difficult for the nucleus with six protons to hold on to ten electrons, that is, four extra electrons.
    • It could lose four electrons forming C4+ cation. But it would require a large amount of energy to remove four electrons leaving behind a carbon cation with six protons in its nucleus holding on to just two
      electrons.
Why are covalent compounds poor conductors of electricity in 10th Science Chapter 4?

Covalent compounds are formed by the sharing of electrons. Since the electrons are shared between atoms and no charged particles are formed, such covalent compounds are generally poor conductors of electricity.

What is meant by catenation as per Class 10 Science Chapter 4?

The unique ability to form bonds combining one atom with other atoms of carbon, giving rise to large molecules is called catenation.

What is Glacial acid in Chapter 4 of class 10 Science?

The melting point of pure ethanoic acid is 290 K and hence it often freezes during winter in cold climates. This gave rise to its name glacial acetic acid.

What are isomers according to Class 10 Science Chapter 4?

Compounds with identical molecular formula but different structures
are called structural isomers.

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