TS 10th Class Physical Science Bits Chapter 12 Carbon and its Compounds

These TS 10th Class Physical Science Bits with Answers Chapter 12 Carbon and its Compounds will help students to enhance their time management skills.

TS 10th Class Physical Science Bits Chapter 12 Carbon and its Compounds

Question 1.
The number of covalent bonds that a carbon atom can form is ( )
(A) 2
(B) 4
(C) 6
(D) 1
Answer:
(B) 4

Question 2.
In excited state a carbon atom gets Its one of the ‘2s’ electrons to ( )
(A) 2P_x
(B) 2P_y
(C) 2P_z
(D) 3s
Answer:
(C) 2P_z

Question 3.
The bond angle in methane molecule ( )
(A) 109°28′
(B) 104°31′
(C) 107°48′
(D) 120°
Answer:
(A) 109°28′

Question 4.
The carbon compound having sp2 hybridizatIon ( )
(A) CH₄
(B) C₂H₄
(C) C₂H₂
(D) C₄H₁₀
Answer:
(B) C₂H₄

Question 5.
Amorphous allotrope of carbon is: ( )
(A) graphite
(B) diamond
(C) sugar charcoal
(D) fullerene
Answer:
(C) sugar charcoal

Question 6.
The hardest allotrope of carbon: ( )
(A) graphite
(B) lamp black
(C) diamond
(D) fullerene
Answer:
(C) diamond

Question 7.
The number of covalent bonds in pentane s ………………………. . ( )
(A) 5
(B) 12
(C) 16
(D) 17
Answer:
(D) 17

Question 8.
The pair of elements which exhibit property of catenation Is ( )
(A) carbon & sulphur
(B) chlorine & carbon
(C) carbon & phosphorus
(D) sulphur & phosphonic
Answer:
(C) carbon & phosphorus

Question 9.
The molecular formula of an organic compound Is C₂H₆. This compound belongs to the following homologous series. ( )
(A) alkenes
(B) alkynes
(C) alkalies
(D) amines
Answer:
(C) alkalies

Question 10.
The products obtained in complete combustion of hydrocarbons is ( )
(A) CO+H₂O
(B) CO₂+H₂
(C) CO₂+H₂O
(D) CO+H₂
Answer:
(C) CO₂+H₂O

Question 11.
The compound that reacts with chlorine in presence of sunlight to form chloroform is ( )
(A) CH₃Cl
(B) CH₂Cl
(C) CH₂Cl₂
(D) CCl₄
Answer:
(C) CH₂Cl₂

Question 12.
The word root used for saturated hydrocarbons is ……………………. . ( )
(A) yn
(B) -one
(C) al
(D) an
Answer:
(D) an

Question 13.
The secondary suffix used to denote functional group ketone is ( )
(A) -one
(B) -ol
(C) al
(D) olc acid
Answer:
(A) -one

Question 14.
The formula of esters – ( )
(A) -CHO
(B) -COOR
(C) -C=O
(D) -COOH
Answer:
(B) -COOR

Question 15.
The name of the compound with formula CH₂ = CH- -CH-CH₃ is ()
(A) pentanol
(B) heptanol
(C) dichloroethane
(D) trichloromethane
Answer:
(A) pentienol

Question 16.
Most of the aromatic compounds burn with ( )
(A) blue colour flame
(B) red colour flame
(C) sooty flame
(D) non-luminous flame
Answer:
(C) sooty flame

Question 17.
Open chain hydro-carbons are also called –
(A) aromatic hydrocarbons
(B) aliphatic hydrocarbons
(C) alkenes
(D) alkynes
Answer:
(B) aliphatic hydrocarbons

Question 18.
The general formula of Alkenes is ( )
(A) C_nH_2n+2
(B) C_nH_2n
(C) C_nH_2n-2
(D) C_nH_{2n- 1}
Answer:
(B) C_nH_2n

Question 19.
Hydrocarbnc containing at least one triple bond between carbon atoms are called ( )
(A) Alkenes
(B) Alkanes
(C) Aikynes
(D) Aldehydes
Answer:
(C) Aikynes

Question 20.
The general molecular formula of a carboxylic add is ………………….. . ( )
(A) R-COOH
(B) R-OH
(C) -COOR
(D) -NH₂
Answer:
(A) R-COOH

Question 21.
If one hydrogen atom is replaced from NH₃ by an alkyl group we get – ( )
(A) secondary amines
(B) tertiary amines
(C) primary amines
(D) hexo amines
Answer:
(C) primary amines

Question 22.
The isomer of n-butane is ( )
(A) dichiobutane
(B) isobutane
(C) tertiary butane
(D) primary butane
Answer:
(B) isobutane

Question 23.
Carbon compounds having same molecular formula but different properties are known as: ( )
(A) allotropes
(B) Isomers
(C) homologues
(D) salt family
Answer:
(B) Isomers

Question 24.
Unsaturated hydrocarbons with multiple bonds undergo ( )
(A) catalytic reactions
(B) reversible reactions
(C) double displacement reactions
(D) addition reactions
Answer:
(D) addition reactions

Question 25.
The common name of ethanol is …………………………….. . ( )
(A) methyl alcohol
(B) methyl acetate
(C) ethyl alcohol
(D) ethyl salicilate
Answer:
(C) ethyl alcohol

Question 26.
The common sources of ethnol : ( )
(A) wheat
(B) barley
(C) corn
(D) all of A, B and C
Answer:
(D) all of A, B and C

Question 27.
The important Impurity added to ethanol to make it undrinkable is ( )
(A) methanol
(B) formaldehyde
(C) acetone
(D) benzene
Answer:
(A) methanol

Question 28.
Cough syrups contain as important solvent : ( )
(A) formaldehyde
(B) acetone
(C) ethanol
(D) methanol
Answer:
(C) ethanol

Question 29.
Ethanoic add is also known as – ( )
(A) formic acid
(B) acetic acid
(C) oxalic acid
(D) citric acid
Answer:
(B) acetic acid

Question 30.
Ethanoic add reacts with sodium carbonate and releases ( )
(A) H₂
(B) CO₂
(C) SO₂
(D) NO₂
Answer:
(B) CO₂

Question 31.
The negative value of logarithm of dissociation constant is denoted as: ( )
(A) pH
(B) pk_a
(C) pl_n
(D) nl^x
Answer:
(B) pk_a

Question 32.
The reaction between carboxylic acid and an alcohol in the presence of con. H₂SO₄ to form sweet smelHng substance is called …………….. . ( )
(A) fermentation
(B) saponification
(C) distillation
(D) esterification
Answer:
(D) esterification

Question 33.
The ester used to remove nail polish is ……………………. . ( )
(A) ethyl acetate
(B) methyl acetate
(C) tribromo acetate
(D) benzol acetate
Answer:
(B) methyl acetate

Question 34.
Esters of higher fatty acids and trihydroxy alcohol are known as ( )
(A) glycerol
(B) glycol
(C) glucose
(D) gasoline
Answer:
(A) glycerol

Question 35.
A solution in which the sôlute particles dispersed in the solvent are less than 1 nm in diameter is called ( )
(A) colloidal solution
(B) saturated solution
(C) true solution
(D) buffer solution
Answer:
(C) true solution

Question 36.
A spherical aggregate of soap molecules in water is called ……………………….. . ( )
(A) foam
(B) fog
(C) suspension
(D) micelle
Answer:
(D) micelle

Question 37.
These carbon compounds make oil and dirt present on the cloth come out into water- ( )
(A) perfumes
(B) soaps
(C) detergents
(D) both B&C
Answer:
(D) both B&C

Question 38.
The polar end of soap molecule is ……………………. in nature : ( )
(A) hydrophilic
(B) hydrophobic
(C) hydrogenic
(D) greasy
Answer:
(A) hydrophilic

Question 39.
Saturated hydrocarbons undergo : ( )
(A) addition reactions
(B) substitution reactions
(C) reversible reactions
(D) double displacement reactions
Answer:
(B) substitution reactions

Question 40.
Carbon compounds with identical molecular formula but different structural formulae are called- ( )
(A) catalysts
(B) homologues
(C) isotopes
(D) Isomers
Answer:
(D) Isomers

Question 41.
The number of sigma bonds in ethane (C₂H₆) molecule ( )
(A) 3
(8) 5
(C) 7
(D) 6
Answer:
(C) 7

Question 42.
The IUPAC name of CH₂=CH group is ( )
(A) vinyl
(B) ethyl
(C) ethenyl
(D) ethynyl
Answer:
(C) ethenyl

Question 43.
n-butane and iso-butane are a pair of ( )
(A) isomers
(B) allotropes
(C) homologues
(D) Isotopes
Answer:
(A) isomers

Question 44.
Dimethyl ether is the isomer of ( )
(A) methyl alcohol
(B) ethyl alcohol
(C) diethyl ether
(D) ethanol
Answer:
(B) ethyl alcohol

Question 45.
One or more hydrogen atoms of alkanes can be replaced by halogens, nitro group and sulphonic acid group. Such reactions are known as – ( )
(A) substitution reactions
(B) addition reactions
(C) decomposition reactions
(D) catalytic reactions
Answer:
(A) substitution reactions

Question 46.
Which of the following reacts with water to give ethane? ( )
(A) C₂H₅OH
(B) C₂H₅-O- C₂H₅
(C) CH₃OH
(D) C₂H₅MgBr
Answer:
(D) C₂H₅MgBr

Question 47.
The final product In the chlorination of methane is ( )
(A) CCl₄
(B) CHCl₃
(C) CH₂Cl₂
(D) CH₃Cl
Answer:
(A) CCl₄

Question 48.
Which of the following hydrocarbon is a liquid at room temperature? ( )
(A) ethane
(B) butane
(C) hexane
(D) methane
Answer:
(C) hexane

Question 49.
Which of the following ¡s a planar molecule? ( )
(A) CH₃-CH₃
(B) CH₂=CH₂
(C) CH C-CH₃
(D) cyclohexane
Answer:
(B) CH₂=CH₂

Question 50.
Propyne and propene can be distinguished by – ( )
(A) Conc.H₂SO₄
(B) Sodium metal
(C) AgNO₃ in Ammonia
(D) dli KMnO₄
Answer:
(C) AgNO₃ in Ammonia

Question 51.
C-C bond length in diamond ( )
(A) 1.4A°
(B) 1.42A°
(C) 1.54A°
(D) 1.3A°
Answer:
(C) 1.54A°

Question 52.
Unsaturated hydrocarbons among the following : ( )
(A) propane
(B) ethene
(C) ethane
(D) butane
Answer:
(B) ethene

Question 53.
For artificial ripening of fruits, the hydrocarbon used is – ( )
(A) acetylene
(B) methane
(C) butane
(D) ethane
Answer:
(A) acetylene

Question 54.
The allotrope of carbon which has tetrahedral structure ( )
(A) graphite
(B) coke
(C) animal charcoal
(D) Diamond
Answer:
(D) Diamond

Question 55.
Soap is obtained by the hydrolysis of oil in the presence of a base. This process is called ( )
(A) fermentation
(B) esterification
(C) saponification
(D) fractionation
Answer:
(C) saponification

Question 56.
Gas used is welding is – ( )
(A) ethylene
(B) ethane
(C) benzene
(D) ethyne
Answer:
(D) ethyne

Question 57.
The arrangement of carbon atoms In graphite is – ( )
(A) tetrahedral
(B) hexagonal rings
(C) octagonal rings
(D) nanogonal rings
Answer:
(B) hexagonal rings

Question 58.
Name of the compound having molecular formula C₆H₁₂ ( )
(A) hexane
(B) hexyne
(C) hexene
(D) butane
Answer:
(C) hexene

Question 59.
Ethanol-containing pyridine is called – ( )
(A) absolute alcohol
(B) rectified spirit
(C) beer
(D) denatured spirit
Answer:
(D) denatured spirit

Question 60.
Allotrope of carbon among the following : ( )
(A) propane
(B) coke
(C) soap
(D) ethene
Answer:
(B) coke

Question 61.
Alkenes are more reactive than alkanes. This is due to ( )
(A) double bond
(B) single bond
(C) hydrogen bond
(D) triple bond
Answer:
(A) double bond

Question 62.
Soaps are – ( )
(A) fatty alcohols
(B) triesters
(C) salts of fatty acids
(D) fatty alcohol sulphates
Answer:
(C) salts of fatty acids

Question 63.
The valency of carbon in carbon compounds: ( )
(A) 2
(B) 3
(C) 4
(D) 5
Answer:
(C) 4

Question 64.
Denatured spirit contains: ( )
(A) methyl alcohol
(B) acetic acid
(C) acetol aldehyde
(D) tartaric acid
Answer:
(A) methyl alcohol

Question 65.
Graphite is used as lubricant because of its ( )
(A) metallic lustre
(B) soapy touch
(C)low density
(D) conductivity
Answer:
(B) soapy touch

Question 66.
The functional group of alcohol is ( )
(A) -COOH
(B) -COOR
(C) CHO
(D) -OH
Answer:
(D) -OH

Question 67.
The product obtained when ethylene reacts with hydrogen is ( )
(A) C₂H₆
(B) C₂H₄OH
(C) C₂H₈
(D) C₂H₂
Answer:
(A) C₂H₆

Question 68.
An example of aromatic hydrocarbon is ………………………. . ( )
(A) acetylene
(B) propane
(C) benzene
(D) acetone
Answer:
(C) benzene

Question 69.
A series of compounds In which the same functional group substitutes for hydrogen In a carbon compound is called – ( )
(A) octagonal series
(B) homologous series
(C) halogen series
(D) active element series
Answer:
(B) homologous series

Question 70.
The succeeding member of the homologous series that follows C₄H₈ is ( )
(A) C₅H₁₂
(B) C₅H₈
(C) C₅H₁₀
(D) C₆H₁₂
Answer:
(C) C₅H₁₀

Question 71.
Unsaturated carbon compounds usually give ( )
(A) yellow flame
(B) blue flame
(C) orange flame
(D) green flame
Answer:
(A) yellow flame

Question 72.
Animal fats are harmful to health because they contain – ( )
(A) saturated hydrocarbons
(B) unsaturated alcohols
(C) unsaturated fatty acids
(D) saturated fatty acids
Answer:
(D) saturated fatty acids

Question 73.
Alcohols react with sodium metal and liberate: ( )
(A) hydrogen
(B) carbon dioxide
(C) oxygen
(D) chlorine
Answer:
(A) hydrogen

Question 74.
The sweet-smelling substances formed when carboxylic acid reacts with alcohols ( )
(A) soaps
(B) tinctures
(C) esters
(D) fuels
Answer:
(C) esters

Question 75.
These are usually utilised to make shampoos ( )
(A) esters
(B) phenols
(C) aspirin
(D) shampoos
Answer:
(D) shampoos

Question 76.
Acetylene can be prepared by the action of water on ………………… . ( )
(A) Mg₃N₂
(B) Al₄C₃
(C) CaC₂
(D) CaH₂
Answer:
(B) Al₄C₃

Question 77.
The reagent that can be used to distinguish between alkenes and alkanes is ……………….. .
(A) Chlorine
(B) Hydrogen
(C) Flurolne
(D) Bromine
Answer:
(D) Bromine

Question 78.
An Important reaction that ethylene can undergo: ( )
(A) displacement
(B) addition
(C) substitution
(D) reversible
Answer:
(C) substitution

Question 79.
If all the hydrogen atoms In methane are displaced by chlorine, the compound formed is ( )
(A) chloroform
(B) carbon tetrachloride
(C) methylene chloride
(D) methyl chloride
Answer:
(B) carbon tetrachloride

Question 80.
Another name for Alkanes is ( )
(A) olefins
(B) polythenes
(C) paraffins
(D) acetylenes
Answer:
(C) paraffins

Question 81.
The number of hydrogen atoms present in butane. ( )
(A) 4
(B) 8
(C) 12
(D) 10
Answer:
(D) 10

Question 82.
When an amide is heated after adding a base, the gas liberated Is ( )
(A) HCl
(B) NO₂
(C) NH₃
(D) SO₂
Answer:
(C) NH₃

Question 83.
The maximum valency of carbon is ………………………. . ( )
(A) 4
(B) 3
(C) 2
(D) 5
Answer:
(A) 4

Question 84.
The property of carbon atoms by means of which they form covalent bonds between themselves and form long chains are closed rings Is …………………….. . ( )
(A) Isomerism
(B) saponification
(C) fermentation
(D) catenation
Answer:
(D) catenation

Question 85.
The number of isomers having molecular formula C₄H₁₀ is ( )
(A) 4
(B) 2
(C) 6
(D) 3
Answer:
(B) 2

Question 86.
The molecular formula of Formal dehyde is ……………………… . ( )
(A) CH₃CHO
(b) CH₃COOH
(C) CH₃OH
(D) HCHO
Answer:
(D) HCHO

Question 87.
A solid fuel among the following ( )
(A) butane
(B) gobar gas
(C) coke
(D) diesel
Answer:
(C) coke

Question 88.
The hydrocarbon formed by hydrolysis of alumInium carbide is ( )
(A) methane
(B) acetylene
(C) ethane
(D) pentane
Answer:
(A) methane

Question 89.
benzene Is formed by passing the following compound through hot pipe: ( )
(A) C₂H₂
(B) CH₄
(C) C₂H₄
(D) C₄H₁₀
Answer:
(A) C₂H₂

Question 90.
The hydrocarbon used In preparation of plastics : ( )
(A) alkanes
(B) alkenes
(C) alkynes
(D) esters
Answer:
(B) alkenes

Question 91.
IUPAC name of img ( )
(A) Chlorobutane
(B) 2 – Chlorobutane
(C) 2, 3 – chloroquine
(D) 2, 3-dichlorobutane
Answer:
(D) 2, 3-dichlorobutane

Question 92.
If 2 ml of acetic add was added slowly in drops to 5 ml of water then we will notice ( )
(A) The acid forms a separate layer on the top of water.
(B) Water forms a separate layer on the top of the acid.
(C) Formation of a clear and homogenous solution.
(D) Formation of a pink and clear solution.
Answer:
(C) Formation of a clear and homogenous solution.

Question 93.
When acetic acid reacts with ethyl alcohol, we add conc. H₂SO₄, it acts as …………………… and the processes Called ( )
(A) oxidizing agent, saponification
(B) dehydrating agent, esterification
(C) reducing agent, esterification
(D) Acid & esterification
Answer:
(B) dehydrating agent, esterification

Question 94.
Oxidant undergoes reaction. ( )
(A) oxidation
(B) reduction
(C) combustion
(D) hydration
Answer:
(A) oxidation

Question 95.
The number of hybrid orbitals formed in sp⁴ hybridization ( )
(A) 2
(B) 3
(C) 4
(D) 5
Answer:
(D) 5

Question 96.
The number or sigma and pi bonds present In ethyne is ( )
(A)2,3
(B)5,1
(C)1,5
(D)3,2
Answer:
(D)3,2

Question 97.
2 ml of ethanoic acid was taken in each of the three test tubes A, B and C and 2 ml, 4 ml and 8 ml water was added to them, respectively. A clear solution is obtained in: ( )
(A) Test tube A only
(B) Test tubes A & B only
(C) Test tubes B and C only
(D) All the test tubes
Answer:
(D) All the test tubes

Question 98.
A few drops of ethano4c acid were added to solid sodium carbonate, The possible results of the actions are ( )
(A) A hissing sound was evolved
(B) Brown fumes evolved
(C) Brisk effervescence occurred
(D) A pungent-smelling gas evolved
Answer:
(C) Brisk effervescence occurred

Question 99.
Which of the following is not an allotrophic Form of carbon? ( )
(A) Fluorine
(B) Fuilerence
(C) Diamond
(D) Graphite
Answer:
(A) Fluorine

Question 100.
2C₂H₆+7O₂ 4CO₂+6H₂O+energy. This is …………………… type of reaction. ( )
(A) reduction
(B) oxidation
(C) combustion
(D) addition
Answer:
(C) combustion

Question 101.
Bad conductor of electricity is ( )
(A) Graphite
(B) Graphen
(C) Diamond
(D) Nanotube
Answer:
(C) Diamond

Question 102.
IUPAC name of ( )
(A) 1-Hydroxy-heptane-6-one
(B) 7-Hydroxy-heptane-2-one
(C) 6-Hydroxy-hexane-2 – one
(D) 1-Hydroxy-hexane-5-one
Answer:
(B) 7-Hydroxy-heptane-2-one

Question 103.
Which of the following is a good conductor of heat and electricity? ( )
(A) Anthracite
(B) Charcoal
(C) Diamond
(D) Graphite
Answer:
(D) Graphite

Question 104.
Chief component of cooking as is ( )
(A) butane
(B) methane
(C) ethane
(D) octane
Answer:
(A) butane

Question 105.
A dilute solution of ethanoic acid in water is called ( )
(A) Tincture of iodine
(B) Fehlings solution
(C) vinegar
(D) Tollens reagent
Answer:
(C) vinegar

Question 106.
Ethanol on oxidation gives ( )
(A) Ethane
(B) Formalin
(C) Ethanoic acid
(D) Methane
Answer:
(C) Ethanoic acid

Question 107.
n-butane and isobutane are ………………….. . ( )
(A) alkenes
(B) alkynes
(C) isomers
(D) polymers
Answer:
(C) isomers

Question 108.
What property of carbon allows It to form a large number of carbon compounds? ( )
(A) Tetra valency
(B) catenation
(C) electronegativity
(D) electropositivity
Answer:
(C) electronegativity

Question 109.
Compounds made up of carbon and hydrogen only are called ……………. .( )
(A) alkanes
(B) alkenes
(C) alkynes
(D) hydrocarbons
Answer:
(D) hydrocarbons

Question 110.
Open chain saturated hydrocarbons are called ……………. . ( )
(A) paraffins
(B) alkenes
(C) alkynes
(D) alkyl groups
Answer:
(A) paraffins

Question 111.
Diamond and graphite are ……………. . ( )
(A) Isomers
(B) allotropes
(C) homologous
(D) metals
Answer:
(B) allotropes

Question 112.
C₆₀ has arranged by ……………. pentagons and – hexagons. ( )
(A) 20, 12
(B) 12, 20
(C) 21, 20
(D) 12, 01
Answer:
(B) 12, 20

Question 113.
Carbon compounds containing double and triple bonds are called ……………. . ( )
(A) saturated hydrocarbons
(B) unsaturated hydrocarbons
(C) semi saturated hydrocarbons
(D) hydrocarbons
Answer:
(B) unsaturated hydrocarbons

Question 114.
A very dilute solution of ethanoic acid is ……………. . ( )
(A) ethyne
(B) ethane
(C) vinegar
(D) ethene
Answer:
(C) vinegar

Question 115.
When sodium metal Is dropped in ethanol ……………. gas will be released. ( )
(A) hydrogen
(B) sodium vapour
(C) ethane
(D) ethylene
Answer:
(A) hydrogen

Question 116.
Number of single covalent bonds in ammonia are ……………. .( )
(A) 2
(B) 3
(C) 4
(D) 1
Answer:
(B) 3

Question 117.
Type of reactions shown by alkanes is ………………………. . ()
(A) addition
(B) thermal
(C) substitution
(D) chain
Answer:
(C) substitution

Question 118.
The distance between two graphite layers is ………………………. . ()
(A) 3Å
(B) 4Å
(C) 3.6Å
(D) 3.35Å
Answer:
(D) 3.35Å

Question 119.
‘Carboxytic acid’ functional group is ………………………. . ()
(A) -OH
(B) -OCH
(C) -COOH
(D) -C=O
Answer:
(C) -COOH

Question 120.
General formula of saturated hydrocarbon is ………………………. . ()
(A) C_nH₂n
(B) C_nH_2n+2
(C) C_nH_2n-2
(D) C_nH₂n
Answer:
(B) C_nH_2n+2

Question 121.
Alkane hydrolysis of ester-producing soaps is called ………………………. . ()
(A) carbonation
(B) esterlilcatlon
(C) calcination
(D) saponification
Answer:
(D) saponification

Question 122.
In soap molecule, the end with is called ………………………. .
(A) hydrophilic end
(B) hydrophobic end
(C) micelle
(D) dirt
Answer:
(A) hydrophilic end

Question 123.
IUPAC name of glycerol is ………………………….. . ( )
(A) propane
(B) propanol
(C) propane -1, 2, 3 – diol
(D) propane -1, 2, 3 – troll
Answer:
(C) propane -1, 2, 3 – diol

Question 124.
The carboxylic acid used to preserve pickles is ()
(A) Methanoic acid
(B) Propanoic acid
(C) Ethanoic acid
(D) Butanoic acid
Answer:
(C) Ethanoic acid

Question 125.
The first two members of the alkene senes is ……………… .
(A) methane, ethene
(B) methane, ethane
(C) ethene, propene
(D) ethyne, propyne
Answer:
(C) ethene, propene

Question 126.
……………………………. is also known as marsh gas. ( )
(A) Methane
(B) Ethane
(C) Propane
(D) Butane
Answer:
(A) Methane

Question 127.
Natural gas is a mixture of gaseous ( )
(A) hydrocarbons
(B) esters
(C) acids
(D) bases
Answer:
(A) hydrocarbons

Question 128.
………………………… reacts with sodium metal to produce hydrogen gas. ( )
(A) Alcohol
(B) Acid
(C) Ester
(D) Ketone
Answer:
(A) Alcohol

Question 129.
Synthetic detergent is called ……………………….. detergent
(A) washing detergent
(B) surf
(C) soapless
(D) odourless
Answer:
(C) soapless

Question 130.
…………………………… is better than soap for washing clothes in hard water. ( )
(A) Detergent
(B) Synthetic detergent
(C) Surf
(D) Soap water
Answer:
(B) Synthetic detergent

Question 131.
The form of carbon which is known as black lead is …………………… . ( )
(A) coal
(B) charcoal
(C) graphite
(D) graphene
Answer:
(C) graphite

Question 132.
Carbon compounds have usually low melting points and boiling points because they are …………………… in nature. ( )
(A) covalent
(B) ionic
(C) chemical
(D) gases
Answer:
(A) covalent

Question 133.
Compounds of carbon with hydrogen alone are called ……………….. . ( )
(A) hydroxy
(B) carboxy
(C) carbohydrates
(D) hydrocarbons
Answer:
(D) hydro carbons

Question 134.
Ethene and ethyne are examples of ……………… hydrocarbons. ( )
(A) saturated
(B) unsaturated
(C) semi saturated
(D) supersaturated
Answer:
(B) unsaturated

Question 135.
Ethyne has ………………………… carbon-hydrogen single bonds. ( )
(A) 3
(B) 4
(C) 2
(D) 1
Answer:
(C) 2

Question 136.
The IUPAC name of acetylene is …………………….. . ( )
(A) ethane
(B) ethene
(C) ethyne
(D) ethyl
Answer:
(C) ethyne

Question 137.
The next homologue of C₂H₅OH is ( )
(A) C₃H₇OH
(B) C₃H₆OH
(C) C₄H₇OH
(D) CH₆OH
Answer:
(A) C₃H₇OH

Question 138.
The sodium salt of a long chain fatty acids is called …………………. . ( )
(A) sodium salt
(B) acidic fat
(C) detergent
(D) soap
Answer:
(D) soap

Question 139.
Hexane ………………….. . ( )
(A) C₆H₆
(B) C₆H₁₂
(C) C₆H₁₄
(D) C₆H₁₀
Answer:
(C) C₆H₁₄

Question 140.
Butene …………………….. . ( )
(A) C₄H₆
(B) C₄H₁₀
(C) C₆H₈
(D) C₄H₄
Answer:
(A) C₄H₆