CBSE Class 10 Science Carbon and its Compounds MCQs Set 03

Question. Which of the following is correct about the structure of diamond? 
(a) Carbon atoms are held together by single covalent bonds.
(b) Electrons move freely through the structure.
(c) Layers of atoms slide easily over each other.
(d) Carbon atoms conduct electricity in the molten state.

Answer : A

Question : Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
(a) Helium
(b) Neon
(c) Argon
(d) Krypton

Answer :  B

Question : The number of C-H bonds in ethane(C₂H₆) molecule are:
(a) 10
(b) 8
(c) 6
(d) 4

Answer :  C

Question : Ionic compounds have does not show below property.
(a) High melting point
(b) High boiling point
(c) Conduction of electricity in solid state
(d) Conduction of electricity in molten state

Answer :  C

Question : Rigid Three dimensional structure of carbon allotrope forming 4 bond with each carbon.
(a) Fullerene
(b) Diamond
(c) Graphite
(d) Carbon ball

Answer :  B

Question : 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

Answer :  A

Question : Which is not correct for isomers of a compound?
(a) They differ in physical properties
(b) They differ in chemical properties
(c) They have same molecular formula
(d) They have same structural formula

Answer :  D

Question : Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
(a) Helium
(b) Neon
(c) Argon
(d) Krypton

Answer :  B

Question : Hydrophobic end of micelles attack on ______
(a) Water
(b) Oil
(c) Acid
(d) Base

Answer :  B

Question : The first member of alkyne homologous series is
(a) Ethyne
(b) Ethene
(c) Propyne
(d) Methane

Answer :  A

Question : Three carbon chain with ketone functional group would name in following .
(a) Butanol
(b) Butanoate
(c) Propanol
(d) Propanoate

Answer :  D

Question : Which of the given is a noble gas?
(a) Carbon
(b) Argon
(c) Nitrogen
(d) Hydrogen

Answer :  B

Question : 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

Answer :  A

Question : Atomic number of Cl.
(a) 16
(b) 12
(c) 17
(d) 18

Answer :  C

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 is ethanol?
(a) CH₃CHO
(b) CH₃COOH
(c) CH₃CH₂
(d) CH₃COOCH₃

Answer :  C

Question : Subsequent members of homologous series differ by how many atomic mass units?
(a) 14
(b) 16
(c) 24
(d) 28

Answer :  A

Question : The organic compounds having functional group are known as:
(a) Aldehyde
(b) Ketone
(c) Carboxylic acids
(d) Alcohol

Answer :  C

Question : Cooking oils contain _____
(a) Saturated healthy acids
(b) Saturated acids
(c) Unsaturated healthy acids
(d) Unsaturated fatty acids

Answer :  D

Question : Functional group – CHO is present in which of the following?
(a) Carboxylic acid
(b) Alcohol
(c) Aldehyde
(d) Ketone

Answer :  C

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

Assertion & Reason Bsed MCQs 

(a) Both assertion and reason are true, and reason is correct explanation of the assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of the assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.

Question. Assertion : Diamond and graphite do not have the same crystal structure.
Reason : Diamond is crystalline while graphite is amorphous.

Answer : C

Question. Assertion : Ethanol is first member of the alcohol homologous series. 
Reason: A homologous series can be represented by a general formula.

Answer : D

Question. Assertion : Covalent compounds are generally poor conductor of electricity. 
Reason : They consist of molecules and not ions which can transfer charge.

Answer : A

Question. Assertion : Carbon and its compounds can be used as fuels.
Reason : They are highly inflammable and have high calorific value.

Answer : A

Question. Assertion : Carbon possesses property of catenation. 
Reason : Carbon atoms form double as well as triple bonds during catenation.

Answer : B

Question. Assertion : Both aldehydes and ketones contain carbonyl group.
Reason : In aldehydes, the functional group is attached to atleast one hydrogen atom.

Answer : B

Question. Assertion : Graphite is a good conductor of electricity.
Reason : It has one free valence electron.

Answer : A

Question. Assertion : Diamond is not a good conductor of electricity. 
Reason : It has no free electrons.

Answer : A

Question. Assertion : Graphite is soft and slippery to touch.
Reason : Graphite has sheet like layered structure.

Answer : A

Question. Assertion : Two members of a homologous series have similar chemical properties. 
Reason : Propane and butane are members of same homologous series.

Answer : B

Question. Assertion : Olefins have the general formula C_nH_2n+1.
Reason : There is atleast one double bond between two carbon atoms in their molecules.

Answer : D

Question. Assertion : In alkanes, alkenes and alkynes the valency of carbon is always four. 
Reason : All hydrocarbons except alkanes contain double bonds.

Answer : C

Question. Assertion : Saturated hydrocarbons are chemically less reactive. 
Reason : All the valencies of carbon atom are satisfied by single covalent bonds.

Answer : A

Question. Assertion : Diamond is the hardest natural known substance. 
Reason : Diamond is used for cutting marble, granite and glass.

Answer : B

Question. Assertion : The functional group present in alcohols is –OH.
Reason : It is the same group as present in water, hence water and alcohol have similar properties.

Answer : C

a) Formic acid

b) Acetic acid

c) Citric acid

d) Vinegar

Answer : A

 

Question : The odour of acetic acid resembles that of:

a) Tomato

b) Kerosene

c) Vinegar

d) Lemon juice

Answer : C

 

Question : Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :

a) A gas evolves

b) A solid settles at the bottom

c) The mixture becomes warm

d) The colour of the mixture

Answer : A

 

Question : 2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:

a) The acid formed a separate layer on the top of water

b) Water formed a separate layer on the top of the acid

c) A clear and homogeneous solution is formed

d) A pink and clear solution is formed

Answer : C

 

Question : On adding NaHCO₃ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

a) Calcium Carbonate

b) Calcium Hydroxide

c) Calcium bicarbonate

d) Calcium Acetate

Answer : A

 

Question : Which among the following contains triple bond:

a) C₂H₄

b) C₂H₂

c) C₃H₄

d) C₂H₆

Answer : B

 

Question : The number of covalent bonds in C₅H₁₂ is:

a) 15
b) 16
c) 17
d) 18

Answer : B

 

Question : Which amongst the following does not conduct electricity:

a) CH₃COOH

b) C₃H₇OH

c) HCOOH

d) NaCl(aq)

Answer : B

 

 

Question : Methane reacts with one mole of Chlorine in presence of sunlight to give _________.

The reaction is called_______.

a) Chloromethane, substitution

b) Dichloromethane, addition

c) Trichloromethane, elimination

d) Tetra chloro methane, combustion

Answer : A

 

 

Question : Catenation is maximum in:

a) Carbon

b) Oxygen

c) Sulphur

d) Phosphorous

Answer : A

 

 

Question : Ethane and ethene can be distinguished by using:

a) Bromine water

b) Chlorine water

c) I₂

d) HCl

Answer : A

 

 

Question : The number of isomers of C₆H₁₄ are

a) 4
b) 5
c) 6
d) 7

Answer : C

 

 

Question : Which of the following represents cyclohexane:

a) C₆H₁₄

b) C₆H₁₂

c) C₆H₁₀

d) C₆H₆

Answer : B

 

 

Question : The IUPAC name of the following;

 

a) Butanal

b) Butanoic acid

c) Butanol

d) Pentane

Answer : C

 

 

Question : Which of the following are members of the same homologous series:

a) CH₄ and C₂H₄

b) CH₃OH and CH₃Cl

c) C₂H₅OH and C₃H₇OH

d) CH₃OCH₃ and C₂H₅OH

Answer : C

 

 

Question : The difference in the molecular formula and molecular mass of CH₄ and C₂H₆ is:

a) CH₃ and 12u

b) CH₂ and 12u

c) CH₃ and 14u

d) CH₂ and 14u

Answer : D