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Chemistry Class 10 Chapter 4


Updated: 14 Dec 2023

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Chemistry Class 10 Chapter 4 introduces the concept of “Hydrocarbons”. This is mainly chapter No. 12, “Hydrocarbons”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of chemistry, which cover your course, board papers and clear your chemistry concept for different types of tests.

Chemistry Class 10 Chapter 4 Notes

Hydrocarbons

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Chemistry Class 10 Chapter No. 12 Notes

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SLO Base Questions

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Chemistry Class 10 Chapter No. 12 SLO Questions

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Chemistry Class 10 Chapter 4 MCQs

1. Hydrocarbons are the simplest type of _________________ compounds.
(a) Organic
(b) Covalent
(c) Inorganic
(d) All of these
Show Answer

Organic


2. Hydrocarbons are composed entirely of _________atoms.
(a) C,N
(b) C, H
(c) C, O
(d) C, S
Show Answer

C, H


3. Diesel, gasoline, natural gas and liquefied petroleum gas (LPG) are common examples of _____________.
(a) Hydrocarbons
(b) Amines
(c) Electrovalent
(d) None of these
Show Answer

Hydrocarbons


4. Scientists classify hydrocarbons as ________________and unsaturated hydrocarbons.
(a) Super saturated
(b) Saturated
(c) Unsaturated
(d) All of these
Show Answer

Saturated


5. Saturated hydrocarbons are called________________.
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Butane
Show Answer

Alkanes

To Download Complete Notes of Chemistry Notes 10 Class, Click on the given link.

6. Unsaturated hydrocarbons are called______________.
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Both a and b
Show Answer

Both a and b


7. As hydrocarbons contain only carbon and hydrogen, therefore they are ________________compounds.
(a) Non-polar
(b) Polar
(c) Weakly polar
(d) None of these
Show Answer

Non-polar


8. In hydrocarbons, the atoms are _______________bonded.
(a) Electrovalently
(b) Metallically
(c) covalently
(d) None of these
Show Answer

covalently


9. An alkane is a hydrocarbon that has only ______________bonds.
(a) Double
(b) single
(c) Triple
(d) None of these
Show Answer

single


10. Alkanes are also known as _____________hydrocarbons.
(a) Saturated
(b) Unsaturated
(c) Super-saturated
(d) None of these
Show Answer

Saturated


11. Alkanesdonot contain_______________.
(a) Open chains
(b) rings
(c) Substituents
(d) None of these
Show Answer

rings


12. Alkanes have the general formula ______________where “n” is the number of carbon atoms.
(a) C_nH_{2n}
(b) C_nH_{2n-2}
(c) C_nH_{2n+2}
(d) None of these
Show Answer

C_nH_{2n+2}


13. An alkane in shape of ring is called______________________.
(a) Cyclo alkane
(b) Alkane
(c) Straight chain alkane
(d) None of these
Show Answer

Cyclo alkane


14. The general formula of cycloalkane is_______________.
(a) C_nH_{2n}
(b) C_nH_{2n+2}
(c) C_nH_{2n-2}
(d) None of these
Show Answer

C_nH_{2n}


15. In alkanes and cycloalkanes, all four bonds are ______________covalent bonds.
(a) Triple
(b) Double
(c) single
(d) None of these
Show Answer

single


16. Alkanes and cycloalkanes are _______________.
(a) Highly reactive
(b) Less reactive
(c) Moderate
(d) None of these
Show Answer

Less reactive


17. Alkanes are also called as _____________.
(a) Paraffin’s
(b) Olefins
(c) Monoffins
(d) None of these
Show Answer

Paraffin’s


18. Alkanes and cycloalkanes from a series of compounds known as _____________.
(a) Functional group
(b) Homologus series
(c) Family
(d) None of these
Show Answer

Homologus series


19. The molecular formula of methane is ______________.
(a) CH_4
(b) C_2H_6
(c) C_3H_8
(d) None of these
Show Answer

CH_4


20. The molecular formula of ethane is _____________.
(a) CH_4
(b) C_2H_6
(c) C_3H_8
(d) C_4H_{10}
Show Answer

C_2H_6


21. The condensed formula of ethane is______________________.
(a) CH_3CH_3
(b) CH_4
(c) CH_3CH_2CH_3
(d) None of these
Show Answer

CH_3CH_3


22. C_3H_8 is the molecular formula of _________________.
(a) Pentane
(b) Butane
(c) propane
(d) Ethane
Show Answer

propane


23. The condensed formula for propane is_____________________.
(a) CH_4
(b) CH_3CH_2CH_3
(c) CH_3CH_3
(d) None of these
Show Answer

CH_3CH_2CH_3


24. The molecular formula of butane is ______________.
(a) CH_4
(b) C_2H_6
(c) C_3H_8
(d) C_4H_{10}
Show Answer

C_4H_{10}


25. C_5H_{12} is the molecular formula of _______________.
(a) Pentane
(b) Butane
(c) Heptane
(d) Hexane
Show Answer

Pentane


26. The naming of organic compounds before 1947 was based on the _____________.
(a) Greek system
(b) Common system
(c) Albanian System
(d) None of these
Show Answer

Common system


27. “Each different compound should have a different name”. This was the main principle of ___________.
(a) IUPAC
(b) VSEPR
(c) CFT
(d) MOT
Show Answer

IUPAC


28. The rules for naming an organic compound is________________.
(a) Hybridization
(b) Electrophoresis
(c) Nomenclature
(d) None of these
Show Answer

Nomenclature


29. These alkanes and cycloalkanes can be prepared by_______________.
(a) Addition of alkenes
(b) Addition of alkynes
(c) Reduction from alkyl halides
(d) All of these
Show Answer

All of these


30. The reaction in which an atom or group of atoms are added to a compound that has a double or triple bond is called an ___________reaction.
(a) Addition
(b) Oxidation
(c) Halogenation
(d) None of these
Show Answer

Addition


31. Hydrogenation means addition of _________to alkene or alkyne
(a) Carbon
(b) Hydrogen
(c) Oxygen
(d) None of tehse
Show Answer

Hydrogen


32. In Hydrogenation, the unsaturated hydrocarbons are converted to ____________ hydrocarbons.
(a) Saturated
(b) Stable
(c) Reactive
(d) Non-reactive
Show Answer

Saturated


33. Hydrogenation takes place in the presence of nickel catalyst at _____________temperature.
(a) 500-750 {}^oC
(b) 250-300 {}^oC
(c) 950-1000 {}^oC
(d) None of these
Show Answer

250-300 {}^oC


34. Hydrogenation takes place in the presence of __________catalyst at room temperature.
(a) Nickel
(b) Palladium
(c) Platinum
(d) None of these
Show Answer

Platinum


35. CH_2=CH_2 + H – H \underset{{ 250 - 300 {}^oC }}{\stackrel{ { Ni }}{\longrightarrow}} _______________.
(a) CH_3—CH_3
(b) CH_4
(c) CH_4—CH_2
(d) CH_3—CH_2—CH_3
Show Answer

CH_3—CH_3


36. Reduction means addition of __________________.
(a) Oxygen
(b) Hydrogen
(c) Carbon
(d) None of these
Show Answer

Hydrogen


37. Reduction of alkyl halides occur in the presence of ________ and Hydrochloric acid (HCl) .
(a) Osmium
(b) Ncikel
(c) Zinc dust
(d) All of these
Show Answer

Zinc dust


38. CH_3—I + 2[H] \longrightarrow CH_3—H + H—I .
What are the reagents used in this reaction.
(a) Zn / HCl
(b) Ni / Pt
(c) Pt / Pb
(d) Ni/ pb
Show Answer

Zn / HCl


39. The hydrogen at a time of its generation is called _____________hydrogen.
(a) Atomic
(b) Nascent
(c) Molecular
(d) None of these
Show Answer

Nascent


40. Which of the following member of alkane is a gas?
(a) hexane
(b) Heptane
(c) Propane
(d) Nonane
Show Answer

Propane


41. The first four members of alkanes are __________________.
(a) gases
(b) Liquid
(c) Solid
(d) None of these
Show Answer

gases


42. C_5 \ to \ C_{17} are colorless _______________alkanes.
(a) Gaseous
(b) Liquid
(c) Solid
(d) None of these
Show Answer

Liquid


43. Higher alkanes then C_{17} are colourless ___________.
(a) Gases
(b) Liquids
(c) Solids
(d) None of these
Show Answer

Solids


44. Those alkanes and cycloalkanes are ________________.
(a) Non-polar
(b) Polar
(c) Weakly-polar
(d) None of these
Show Answer

Non-polar


45. Alkanes will be ____________in water.
(a) Soluble
(b) insoluble
(c) Weakly soluble
(d) Non-soluble
Show Answer

insoluble


46. But alkanes will be __________in non-polar organic solvents like benzene, ether, acetone etc.
(a) Soluble
(b) Insoluble
(c) Weakly soluble
(d) None of these
Show Answer

Soluble


47. Alkanes have low ____________point.
(a) Melting
(b) Boiling
(c) Freezing
(d) Both a and b
Show Answer

Both a and b


48. The melting and boiling points of alkane’s __________ regularly in the series with increase in molecular sizes.
(a) Decreases
(b) increases
(c) Constant
(d) None of these
Show Answer

increases


49. The density of alkane’s ________regularly in the series with increase in molecular mass.
(a) increases
(b) Constant
(c) Decreases
(d) Remain Same
Show Answer

increases


50. Alkanes become more _____________as their molecular sizes increase.
(a) Thiner
(b) strict
(c) viscous
(d) None of these
Show Answer

viscous


51. Alkanes are _______________.
(a) Lustrous
(b) Flammable
(c) Vigorous
(d) None of these
Show Answer

Flammable


52. A _________reaction is a reaction in which, an atom or a functional group is replaced by a different functional group.
(a) substitution
(b) Addition
(c) Displacement
(d) None of these
Show Answer

substitution


53. ________________also undergoes substitution reaction.
(a) Transitions
(b) alkanes
(c) Alkali metals
(d) None of these
Show Answer

alkanes


54. The substitution of hydrogen by halogen such as chlorine and bromine is called______________.
(a) Hydrogenation
(b) Addition
(c) Halogenation
(d) None of these
Show Answer

Halogenation


55. Alkanes react with halogen in presence of __________light and produce alkyl halide and hydrogen halide.
(a) Ultra violet
(b) Infrared
(c) Visible
(d) None of these
Show Answer

Ultra violet


56. When methane reacts with chlorine in diffused sunlight, it will produce ____________chloride.
(a) Butyl
(b) Propyl
(c) Ethyl
(d) methyl
Show Answer

methyl


57. Combustion reaction is a class of chemical reactions, which is commonly referred as ________________.
(a) Cutting
(b) Burning
(c) Hammering
(d) None of these
Show Answer

Burning


58. The combustion reaction is highly __________________.
(a) exothermic
(b) Constant
(c) Endothermic
(d) None of these
Show Answer

exothermic


59. Alkanes burn completely in the presence of excess of air (oxygen) to produce a lot of heat, carbon dioxide (CO_2) and ___________________.
(a) Hydrogen gas
(b) water
(c) Fog
(d) None of these
Show Answer

water


60. Exothermic reaction is the chemical reaction in which reaction proceeds and the energy will be_________.
(a) released
(b) Gained
(c) Effect the reaction
(d) None of these
Show Answer

released


61. The energy released in exothermic reaction will be in the form of ___________________.
(a) Heat
(b) Light
(c) Both a and b
(d) None of these
Show Answer

Both a and b


62. Alkenes are _________________hydrocarbons.
(a) Saturated
(b) unsaturated
(c) Super-saturated
(d) None of these
Show Answer

unsaturated


63. Alkenes are hydrocarbons that contain at least one carbon – carbon ________bond.
(a) Single
(b) double
(c) Triple
(d) Quadruple
Show Answer

double


64. Alkenes are also called ________________.
(a) Olefins
(b) Paraffins
(c) Homoffins
(d) None of these
Show Answer

Olefins


65. Olefins is a ________________word which means “oil farming”.
(a) Greek
(b) Latin
(c) Persian
(d) Arabic
Show Answer

Latin


66. The general formula for alkene is ___________.
(a) C_nH_{2n+2}
(b) C_nH_{2n}
(c) C_n(H_2O)_n
(d) None of these
Show Answer

C_nH_{2n}


67. The double bonds in alkene make them ______________than alkanes.
(a) More reactive
(b) Less reactive
(c) Un reactive
(d) None of these
Show Answer

More reactive


68. The functional group of alkene is _________________.
(a) Single bond
(b) Double bond
(c) Triple bond
(d) None of these
Show Answer

Double bond


69. The simplest alkene is _______________.
(a) Ethene
(b) Propene
(c) Butane
(d) Pentene
Show Answer

Ethene


70. The molecular formula of ethane is _______________.
(a) C_5H_{10}
(b) C_4H_8
(c) C_3H_6
(d) C_2H_4
Show Answer

C_2H_4


71. The condensed formula for ethene is ___________.
(a) CH_2=CHCH_{3}
(b) CH_2=CH_2
(c) CH_2=CHCH_2CH_3
(d) None of these
Show Answer

CH_2=CH_2


72. C_4H_3—C_3H_2—C_2H= CH_2 ,
What is the name of the above alkene?

(a) 4-butene
(b) 3-butene
(c) 2-butene
(d) 1-butene
Show Answer

1-butene


73. The Condensed formula of ethane is _________________.
(a) CH_2=CHCH_{3}
(b) CH_2=CH_2
(c) CH_2=CHCH_2CH_3
(d) None of these
Show Answer

CH_2=CH_2


74. In an ____________reaction, the atoms are removed from a molecule to form a double or triple bond.
(a) Addition
(b) Elimination
(c) Condensation
(d) None of these
Show Answer

Elimination


75. Elimination reaction is the opposite of an ______________reaction.
(a) Addition
(b) Oxidation
(c) Displacement
(d) None of these
Show Answer

Addition


76. Alkenes are prepared from a __________organic compound by an elimination reaction.
(a) Super-saturated
(b) Unsaturated
(c) saturated
(d) None of these
Show Answer

saturated


77. In preparation of alkene, atom or group of atoms are __________from two adjacent carbon atoms of the saturated organic compound to produce double bond.
(a) removed
(b) Added
(c) Botha a and b
(d) None of these
Show Answer

removed


78. Dehydration of alcohols means removal of water form __________________.
(a) Chloroform
(b) Glucose
(c) Alcohol
(d) None of these
Show Answer

Alcohol


79. The C_5H_{10} is the molecular formula of _____________.
(a) Butane
(b) pentene
(c) Hexane
(d) Heptane
Show Answer

pentene


80. Ethene is prepared from dehydrating _______.
(a) Ethyl alcohol
(b) Chloroform
(c) Acetone
(d) None of these
Show Answer

Ethyl alcohol


81. The dehydration of ethanol is carried out in the presence of concentrated _________at 180^o .
(a) H_2SO_4
(b) HCl
(c) CCl_4
(d) C_6H_6OH
Show Answer

H_2SO_4


82. In dehydration of ethanol, the sulphuric acid acts as _______________agent.
(a) Oxidizing
(b) Reducing
(c) Dehydrating
(d) None of these
Show Answer

Dehydrating


83. Dehydrohalogenation of alkyl halides means ____________of hydrogen and halogen from adjacent carbon atoms.
(a) Addition
(b) Removal
(c) Concentration
(d) None of these
Show Answer

Removal


84. Ethene is prepared from dehydrohalogenation of ________________.
(a) Chloroethane
(b) Chloroethyne
(c) Chloroethene
(d) None of these
Show Answer

Chloroethane


85. The first ____________members of alkenes are gases.
(a) Two
(b) three
(c) four
(d) five
Show Answer

three


86. Except the first three members of alkenes, others are liquids and the higher alkenes are liquids and the higher alkenes are _______________.
(a) Gases
(b) Liquids
(c) solids
(d) Plasma
Show Answer

solids


87. Alkenes are __________hydrocarbons.
(a) Non-polar
(b) Polar
(c) Weakly-polar
(d) None of these
Show Answer

Non-polar


88. Alkenes are insoluble in _________.
(a) Benzene
(b) Acetone
(c) Chloroform
(d) water
Show Answer

water


89. The melting and boiling points gradually _____________with increase in molecular mass of alkenes.
(a) Decrease
(b) increase
(c) Constant
(d) None of these
Show Answer

increase


90. The density of alkenes also increase with ________________in molecular mass.
(a) Decrease
(b) Increase
(c) Constant
(d) None of these
Show Answer

increase


91. Addition of hydrogen halides means addition of hydrogen and ___________.
(a) Fluorine
(b) Chlorine
(c) Bromine & Iodine
(d) All of them
Show Answer

All of them


92. The order of reacting of alkenes with hydrogen halides is
(a) HI > HBr > HCl
(b) HCl > HBr > HI
(c) HBr > HCl > HI
(d) HI > HCl > HBr
Show Answer

HI>HBr>HCl


93. When hydrogen (H_2) is added to ethene , the double bond is converted into single bond and produces ethane. The process is called_______________.
(a) Hydrogenation
(b) Sulphonation
(c) Chlorination
(d) None of these
Show Answer

Hydrogenation


94. The hydrogenation of alkenes readily occurs in the presence of _________catalyst at 250—300 {}^oC .
(a) Zinc
(b) Platinium
(c) Nickel
(d) Mercury
Show Answer

Nickel


95. Hydrogenation is an ______________process.
(a) Endothermic

(b) Exothermic
(c) Aeration
(d) None of these
Show Answer

Exothermic


96. Hydrogenation of unsaturated organic compound is industrially used for the conversion of _________into ghee.
(a) Vegetable oil
(b) Mustard oil
(c) Soyabean oil
(d) None of these
Show Answer

Vegetable oil


97. CH_2=CH_2 + H_2 \underset{{ 250 - 300 {}^oC }}{\stackrel{ { Ni }}{\longrightarrow}} _______________.
(a) CH4
(b) C2H6
(c) C2H4
(d) C2H2
Show Answer

C2H6


98. ________are alcohols which contain two hydroxyl group on two adjacent carbons.
(a) Fats
(b) Waxes
(c) Glycols
(d) Triglycerides
Show Answer

Glycols


99. Alkenes react with acidified aqueous solution of _____________to decolourize its purple colour.
(a) KMnO_4
(b) CH_3OH
(c) C_6H_6
(d) C_6H_{12}O_6
Show Answer

KMnO_4


100. ________is a plant hormone that triggers fruit ripening.
(a) Ethane
(b) Ethene
(c) Ethyne
(d) None of these
Show Answer

Ethene


101. Alkynes are unsaturated _____________.
(a) Inorganic compounds
(b) Nitrates
(c) Hydrocarbons
(d) None of these
Show Answer

Hydrocarbons


102. Alkynes contain at least one carbon-carbon___________bond.
(a) Triple
(b) Double
(c) Single
(d) None of these
Show Answer

Triple


103. Alkynes have two hydrogen atoms _________ the alkenes.
(a) More than
(b) Less than
(c) Equal to
(d) None of these
Show Answer

Less than


104. The general formula for alkynes are ______________.
(a) C_nH_{2n+2}
(b) C_nH_{2n}
(c) C_2H_{2n-2}
(d) None of these
Show Answer

C_2H_{2n-2}


105. Ethyne, propyne, butyneetc are the examples of ___________.
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) None of these
Show Answer

Alkynes


106. The simplest alkyne is ethyne having the general formula is _________.
(a) CH_2
(b) C_2H_2
(c) C_2H_4
(d) C_2H_6
Show Answer

C_2H_2


107. The combustion of ethyne when it is mixed with pure oxygen produces large amount of heat used for _______.
(a) Welding
(b) Cutting
(c) Mixing
(d) Stabilizing
Show Answer

Welding


108. The condensed formula for ethyne is ____________.
(a) CH \equiv CH
(b) CH \equiv C—CH_3
(c) CH \equiv C—CH_2—CH_3
(d) None of these
Show Answer

CH \equiv CH


109. The molecular formula for propyne is _______________.
(a) C_3H_4
(b) C_3H_6
(c) C_3H_8
(d) C_3H_7
Show Answer

C_3H_4


110. The condensed formula for propyne is _____________.
(a) CH \equiv CH
(b) CH \equiv C—CH_3
(c) CH_3—CH_2—CH_3
(d) None of these
Show Answer

CH \equiv C—CH_3


111. The molecular formula for butyne is ___________.
(a) C_2H_2
(b) C_3H_4
(c) C_4H_6
(d) C_5H_5
Show Answer

C_4H_6


112. Alkynes are prepared form saturated organic compounds by an _____________reaction.
(a) Addition
(b) Detoxification
(c) Elimination
(d) None of these
Show Answer

Elimination


113. The first _________members of alkynes are gases.
(a) 6
(b) 5
(c) 4
(d) 3
Show Answer

3


114. Except the first three members fo alkynes, others are liquids and higher alkynes are ________.
(a) Solids
(b) Liquids
(c) Gases
(d) None of these
Show Answer

Solids


115. Alkynes are _____________, therefore they are insoluble in water.
(a) Polar
(b) Weakly-polar
(c) Non-polar
(d) None of these
Show Answer

Non-polar


116. Alkynes are __________in organic solvents like ether, acetone.
(a) Insoluble
(b) Soluble
(c) Semi-soluble
(d) None of these
Show Answer

Soluble


117. On complete combustion, alkynes produce ______________.
(a) CO_2
(b) H_2O
(c) Energy
(d) All of them
Show Answer

All of them


118. The melting and boiling points and density __________with increase in molecular weight of alkynes.
(a) Increase
(b) Decrease
(c) Constant
(d) None of these
Show Answer

Increase


119. Which one of the following is a substitution reaction.
(a) Halogenation of alkynes
(b) Halogenation of alkenes
(c) Halogenation of alkanes
(d) Oxidation of alkene
Show Answer

Halogenation of alkanes


120. When ethene reacts with HBr, the compound formed is
(a) CH_3—CH_2 –Br
(b) Br—CH_2—CH_2—Br
(c) CH_3—CH_2—CH_8
(d) CH \equiv CH
Show Answer

CH_3—CH_2 –Br


121. Halogenation of methane in the presence of diffused sunlight occurs
(a) Quickly, only in one step
(b) Slowly, only in one step
(c) In a series of four steps
(d) Quickly, in two step
Show Answer

In a series of four steps


122. Dehydrohalogenation of alkylhalide is
(a) Removal of hydrogen
(b) Removal of halogen
(c) Removal of hydrogen and halogen
(d) Addition of hydrogen and halogen
Show Answer

Removal of hydrogen and halogen


123. Which one of the following decolourises Br2 water.
(a) Ethane
(b) Ethene
(c) Propane
(d) Methane
Show Answer

Ethene


124. The general formula of alkane is
(a) C_nH_{2n}
(b) C_nH_{2n \times 2}
(c) C_nH_{2n+2}
(d) C_nH_{2n-2}
Show Answer

C_nH_{2n+2}


125. Dehydration of ethyl alcohol with conc. H_2SO_4 results in the formation of
(a) Ethane
(b) Methane
(c) Ethyne
(d) Ethene
Show Answer

Ethene


126. Substitution reaction is the characteristic of
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) None of these
Show Answer

Alkanes


127. Which one is the least reactive,
(a) Ethyne
(b) Propane
(c) Ethene
(d) Ethane
Show Answer

Ethane


128. The order of reactivity of hydrogen halides with alkienes is
(a) Hl > HCl > HBr
(b) HI < HBr < HCl
(c) HCl > HBr > HI
(d) HI > HBr > HCl
Show Answer

HI > HBr > HCl

Chemistry Class 10 MCQs (All Chapters)


Jawad Khan

Jawad Khan

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