Multiple Choice Questions

Carbon and Its Compounds

Updated for CBSE 2027
Board Exam Preparation
128+ Practice Questions
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Practice Questions with Answers

Total 128 questions available

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Q. 1
Covalent compounds
A
are formed by the sharing of electrons in the bonding atoms.
B
are formed between atoms of metals and non-metals
C
are mostly soluble in water
D
have high melting and boiling point
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Q. 2
The first member of alkyne homologous series is
A
Methane
B
Propyne
C
Ethyne
D
Ethene
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Q. 3
Which is denatured spirit?
A
ethanol and methanol (50%)
B
ethanol only
C
ethanol and methanol (5%)
D
methanol only
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Q. 4
What is the phenomenon of the existence of an element in two or more physical forms within the same physical state called?
A
Isomerism
B
Allotropy
C
Polymerization
D
Catenation
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Q. 5
Which of the following is NOT an allotrope of carbon?
A
Graphite
B
Diamond
C
Fullerenes
D
Buckyballs
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Q. 6
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
Argon
B
Neon
C
Helium
D
Krypton
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Q. 7
Carbon forms stronger bonds due to its:
A
Weak nucleus
B
Strong van der Waals forces
C
Weak covalent bonds
D
Strong force of attraction in its nucleus
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Q. 8
Which of the following sets of compounds have the same molecular formulas?
A
Butane and iso-butane
B
Cyclohexane and hexene
C
Propanal and propanone
D
All of the above
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Q. 9
Which type of carbon compounds commonly exhibit structural isomerism?
A
Alkanes
B
Amines
C
Halides
D
Alcohols
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Q. 10
No of protons, electrons and neutrons respectively in carbon atom is
A
one double bond
B
none of the above
C
all single bonds
D
one triple bond
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Q. 11
Catenation is maximum in:
A
Carbon
B
Oxygen
C
Sulphur
D
Phosphorous
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Q. 12
Which of the following does not belong to the same homologous series?
A
C3H8
B
C₂H
C
CH4
D
C₂H6
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Q. 13
C₂H, belongs to the homologous series of:
A
Alkanes
B
Cyclo alkanes
C
Alkenes
D
Alkynes
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Q. 14
Butanone is a four-carbon compound with the functional group
A
aldehyde.
B
alcohol.
C
carboxylic acid.
D
ketone.
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Q. 15
The bond between two identical non-metallic atom has a pair of electron :
A
unequally shared between two atoms.
B
transferred completely from one atom to another
C
with identical spins.
D
equally shared between them.
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Q. 16
Ethane, with the molecular formula C2H6 has
A
8 covalent bonds.
B
9 covalent bonds.
C
6 covalent bonds.
D
7 covalent bonds.
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Q. 17
Which of the following is correct about the structure of diamond?
A
Electrons move freely through the structure.
B
Carbon atoms conduct electricity in the molten state.
C
Carbon atoms are held together by single covalent bonds.
D
Layers of atoms slide easily over each other.
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Q. 18
IUPAC name of first member of homologous series of ketones is
A
Butanone
B
Propanone
C
Ethanone
D
methanone
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Q. 19
Number of free electron(s) in each carbon atom in graphite is/are
A
four
B
two
C
one
D
three.
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Q. 20
Which of the following statements about diamond and graphite is true?
A
They have same chemical properties.
B
They have same electrical conductivity
C
They have same degree of hardness
D
They have same crystal structure
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Q. 21
In structural isomerism, differences occur in the:
A
Number of atoms
B
Spatial arrangement
C
Electronegativity
D
Molecular weight
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Q. 22
Hydrophobic end of micelles attack on ______
A
Base
B
Acid
C
Water
D
Oil
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Q. 23
A hydrocarbon should have a minimum of how many carbon atoms to show isomerism?
A
Six
B
Five
C
Four
D
Three
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Q. 24
What distinguishes structural isomers from other types of isomers?
A
Number of bonds
B
Atomic number
C
Arrangement of atoms
D
Presence of functional groups
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Q. 25
In diamond, each carbon atom is bonded to four other carbon atoms to form:
A
a structure of a ring
B
a hexagonal array
C
a rigid three-dimensional structure
D
a structure in the shape of a football
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Q. 26
The first member of the alkyne homologous series is
A
ethyne
B
methane
C
propyne
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Q. 27
100% pure ethanol is called
A
Absolute alcohol
B
Denatured alcohol
C
Power alcohol
D
Rectified spirit
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Q. 28
The number of isomers of pentane is:
A
2
B
5
C
4
D
3
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Q. 29
The substance not responsible for the hardness of water is
A
Calcium hydrogen carbonate
B
Calcium carbonate Magnesium carbonate
C
Sodium nitrate
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Q. 30
The isomers always possess similar
A
molecular formula
B
physical properties
C
structural formula
D
chemical properties
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Q. 31
Which of the following statements regarding graphite is not correct?
A
Which of the following statements regarding graphite is not correct?
B
Graphite is a bad conductor of heat and electricity.
C
Graphite possesses a metallic lustre and soapy touch.
D
Graphite is manufactured by heating coke at 3000oC
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Q. 32
Which allotrope of carbon is in the form of the geodesic globe?
A
Fullerene
B
Carbon nanotube
C
Diamond
D
Graphite
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Q. 33
__________ is widely used as a fuel and is a major component of bio-gas and CNG. It is also one of the simplest compounds formed by carbon.
A
Methane
B
Carbon dioxide
C
Propane
D
Ethane
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Q. 34
Why does carbon form compounds mainly by covalent bonding?
A
It shares its valence electrons to complete its octet.
B
There are four electrons in the outermost shell of carbon.
C
It requires large amount of energy to form C4+ or C4–
D
All the above
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Q. 35
Which of the following is not a characteristic of Diamond?
A
Hardest substance
B
High thermal conductivity
C
High refractive index
D
Good conductor of electricity
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Q. 36
Rigid Three dimensional structure of carbon allotrope forming 4 bond with each carbon.
A
Diamond
B
Graphite
C
Carbon ball
D
Fullerene
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Q. 37
Carbon Exists In The Atmosphere In The Form Of:
A
Carbon monoxide in traces and carbon dioxide
B
Only Carbon dioxide
C
Coal
D
Only carbon monoxide
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Q. 38
From where can we get ethanol?
A
Beet root
B
Orange
C
Grapes
D
Sugarcane
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Q. 39
Which of the following statements about diamond and graphite is true?
A
They have same degree of hardness
B
They have same electrical conductivity
C
They have same chemical properties.
D
They have same crystal structure
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Q. 40
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
A
Substitution reaction
B
Addition reaction
C
Oxidation reaction
D
Displacement reaction
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Q. 41
Catenation is maximum in:
A
Oxygen
B
Carbon
C
Phosphorous
D
Sulphur
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Q. 42
Methane is ______
A
Ionic compound
B
Saturated compound
C
nitrogen compound
D
Unsaturated compound
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Q. 43
Which of the following puts the elements in the right order in terms of their valency, starting with the element of lowest valency?
A
H, O, N, C
B
H, C, O, N
C
C, O, N, H
D
O, C, N, H
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Q. 44
Which of the following pairs exhibit isomerism?
A
Ethane and ethene
B
Propane and butane
C
Ethane and propane
D
Butane and 2-methyl propane
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Q. 45
In double covalent bond, there is sharing of:
A
2 electrons
B
6 electrons
C
3 electrons
D
4 electrons
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Q. 46
Which of the following is correct about a diamond's structure?
A
Carbon atoms conduct electricity in the molten state
B
Electrons move freely through the structure
C
Layers of atoms slide easily over each other
D
Carbon atoms are held together by single covalent bonds
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Q. 47
A functional group mainly determines the
A
None of these
B
Physical properties
C
Chemical properties
D
Both
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Q. 48
Which of the following is a crystalline form of carbon ?
A
Graphite
B
Lamp black
C
Coal
D
Charcoal
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Q. 49
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
A
The fuel is wet
B
The fuel is not burning completely
C
The fuel is burning completely
D
The food is not cooked completely
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Q. 50
Which element is NOT typically bonded with carbon in organic compounds?
A
Oxygen
B
Hydrogen
C
Nitrogen
D
Iron
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Q. 51
Rectified spirit is
A
80% ethanol
B
95% ethanol
C
40 to 50% ethanol
D
50% ethanol
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Q. 52
The isomeric pair is
A
Propane and butane
B
Butane and 2-methylpropane
C
Ethane and propane
D
Ethane and ethane
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Q. 53
The odour of acetic acid resembles that of:
A
Kerosene
B
Vinegar
C
Lemon juice
D
Tomato
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Q. 54
Artificial flavour for orange is obtained from
A
octyl acetate
B
amyl acetate
C
isoamyl valerate
D
methyl butyrate
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Q. 55
What is true about covalent compounds? They:
A
are mostly soluble in water.
B
have high melting and boiling point.
C
are formed by the sharing of electrons in the bonding atoms.
D
are formed between atoms of metals and non metals.
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Q. 56
The molecular formula of ethane C₂H6 has:
A
6 covalent bonds.
B
7 covalent bonds
C
8 covalent bonds.
D
9 covalent bonds.
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Q. 57
The odour of acetic acid resembles that of
A
Burning Plastic
B
Vinegar
C
Kerosene
D
Rose
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Q. 58
The nucleus of carbon holds bonds tightly due to:
A
Weak nuclear forces
B
Strong nuclear forces
C
Weak electromagnetic forces
D
Strong electromagnetic forces
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Q. 59
Fullerenes are also known as:
A
Spherical carbon
B
Cubic carbon
C
Fibrous carbon
D
Linear carbon
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Q. 60
Which of the following is not a characteristic of members of a homologous series?
A
Adjacent members differ by one carbon and two hydrogen atoms.
B
They possess varying chemical properties.
C
Their physical properties vary in regular and predictable manner.
D
Their formulae fit the general molecular formula.
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Q. 61
A hydrocarbon should have minimum how many carbon atoms to show isomerism?
A
Five
B
Three
C
Six
D
Four
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Q. 62
Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :
A
The colour of the mixture
B
The mixture becomes warm
C
A solid settles at the bottom
D
A gas evolves
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Q. 63
Carbon's ability to form diverse compounds makes it the basis of:
A
Organic chemistry
B
Inorganic chemistry
C
Analytical chemistry
D
Physical chemistry
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Q. 64
2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:
A
A pink and clear solution is formed
B
The acid formed a separate layer on the top of water
C
Water formed a separate layer on the top of the acid
D
A clear and homogeneous solution is formed
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Q. 65
What property of carbon enables the formation of complex organic molecules?
A
Cationization
B
Isomerism
C
Catenation
D
Hybridization
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Q. 66
The ability of carbon to bond with itself and other elements is known as:
A
Cationization
B
Anionization
C
Catenation
D
Ionization
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Q. 67
Which of the following does NOT contribute to carbon's ability to form large compounds?
A
Tetravalency
B
Catenation
C
Weak bonding capacity
D
Strong nuclear forces
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Q. 68
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
A
Substitution reaction
B
Displacement reaction
C
Oxidation reaction
D
Addition reaction
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Q. 69
Methane reacts with one mole of Chlorine in presence of sunlight to give _________.
The reaction is called_______.
A
Tetra chloro methane, combustion
B
Chloromethane, substitution
C
Dichloromethane, addition
D
Trichloromethane, elimination
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Q. 70
Carboxylic acid containing one carbon atom is
A
Acetic acid
B
Formic acid
C
Vinegar
D
Citric acid
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Q. 71
Graphite is good conductor of electricity due to the
A
presence van der waal forces
B
presence of hexagonal rings
C
presence of ions
D
presence of free electron
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Q. 72
Which type of compounds commonly exhibit structural isomerism?
A
Inorganic compounds
B
Metallic compounds
C
Carbon compounds
D
Ionic compounds
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Q. 73
Structural isomerism is characterized by differences in the:
A
Molecular weight
B
Arrangement of atoms
C
Number of electrons
D
Temperature sensitivity
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Q. 74
By how much atomic mass unit successive members of a homologous series vary?
A
Twelve
B
Fourteen
C
Sixteen
D
One
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Q. 75
2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:
A
A clear and homogeneous solution is formed
B
The acid formed a separate layer on the top of water
C
A pink and clear solution is formed
D
Water formed a separate layer on the top of the acid
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Q. 76
Which is not correct for isomers of a compound?
A
They have same molecular formula
B
They have same structural formula
C
They differ in chemical properties
D
They differ in physical properties
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Q. 77
The First Member Of Alkyne Homologous Series Is:
A
Methane
B
Ethyne
C
Ethene
D
Propyne
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Q. 78
Which allotrope of carbon has a sheet-like structure?
A
Diamond
B
Graphite
C
Fullerenes
D
Amorphous carbon
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Q. 79
The property of self-linkage among identical atoms to form long chain compounds is known as:
A
Halogenation
B
Catenation
C
Isomerisation
D
Superposition
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Q. 80
Hydrocarbons are mainly composed of:
A
Hydrogen and carbon
B
Hydrogen
C
Hydrogen, oxygen and carbon
D
Hydrogen, carbon and nitrogen
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Q. 81
Ionic compounds have does not show below property.
A
High boiling point
B
Conduction of electricity in solid state
C
Conduction of electricity in molten state
D
High melting point
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Q. 82
What property of graphite makes it suitable as a lubricant?
A
High density
B
Hardness
C
Sliding layers
D
Transparency
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Q. 83
What is the minimum number of carbon atoms required in an organic compound to form a branch?
A
3
B
2
C
5
D
4
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Q. 84
Which of the following molecules has all its atoms joined together by double covalent bonds?
A
Carbon dioxide
B
Nitrogen trichloride
C
Water
D
Methane
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Q. 85
Carbon exists in the atmosphere in the form of:
A
carbon dioxide only
B
carbon monoxide only
C
carbon monoxide in traces and carbon dioxide
D
coal
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Q. 86
Which of the following statements is not correct?
A
Two consecutive members of a homologous series differ by a –CH3 group.
B
The members of a homologous series can be represented by one general formula.
C
Different members of a homologous series have similar chemical properties.
D
A common functional group is present in different members of a homologous series.
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Q. 87
Which of the given can be used for the denaturation of ethyl alcohol?
A
Copper sulphate
B
Methyl alcohol
C
Pyridines
D
All of these
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Q. 88
Catenation is maximum in:
A
Oxygen
B
Sulphur
C
Carbon
D
Phosphorous
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Q. 89
Carboxylic acid containing one carbon atom is
A
Vinegar
B
Citric acid
C
Acetic acid
D
Formic acid
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Q. 90
The odour of acetic acid resembles that of:
A
Tomato
B
Kerosene
C
Vinegar
D
Lemon juice
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Q. 91
Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :
A
A solid settles at the bottom
B
The mixture becomes warm
C
A gas evolves
D
The colour of the mixture
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Q. 92
A molecule of ammonia (NH₃) has
A
Two double bonds and one single bond
B
Only single bonds
C
Only double bonds
D
Only triple bonds
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Q. 93
Compounds with _______ molecular formula with different structures called _______
A
Same, monomeric structures
B
Different, monomeric structures
C
Same, structural isomerism
D
Different, structural isomerism
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Q. 94
Atomic number of Cl.
A
12
B
16
C
18
D
17
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Q. 95
Butanone is a four carbon compound with functional group:
A
ketone
B
carboxylic acid
C
aldehyde
D
alcohol
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Q. 96
Which of the following statements is correct about a substance that has a giant covalent structure?
A
It conducts electricity in the molten state.
B
All its ions are arranged in a giant three dimensional lattice.
C
It dissolves in water but is more soluble in organic solvents.
D
A large amount of energy is needed to break down the lattice structure.
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Q. 97
How many number of carbon atoms are joined in a spherical molecule of Buckminsterfullerene?
A
90
B
30
C
120
D
60
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Q. 98
Which of the following is not an allotropic form of carbon?
A
Diamond
B
Fluorine
C
Graphite
D
Fullerene
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Q. 99
What is the color of graphite?
A
Transparent
B
Greyish black
C
White
D
Blue
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Q. 100
Sodium carbonate solution is added to dilute ethanoic aci It is observed that :
A
A solid settles at the bottom
B
The mixture becomes warm
C
The colour of the mixture
D
A gas evolves
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Q. 101
Which of the following exists as a simple triatomic molecule?
A
Fluorine
B
Argon
C
Nitrogen
D
Ozone
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Q. 102
The allotrope of carbon which is a good conductor of heat and electricity is:
A
Graphite
B
Charcoal
C
None of these
D
Diamond
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Q. 103
Organic compounds will always contains
A
hydrogen
B
nitrogen
C
sulphur
D
carbon
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Q. 104
Which one of the given is an unsaturated hydrocarbon?
A
Butane
B
Propane
C
Decane
D
Acetylene
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Q. 105
Functional group – CHO is present in which of the following?
A
Aldehyde
B
Ketone
C
Carboxylic acid
D
Alcohol
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Q. 106
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that
A
the fuel is not burning completely.
B
the fuel is wet.
C
the fuel is burning completely.
D
the food is not cooked completely.
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Q. 107
The property of self-linkage among identical atoms to form long chain compounds is known as:
A
Superposition
B
Halogenation
C
Isomerisation
D
Catenation
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Q. 108
A functional group mainly determines the
A
None of these
B
Chemical properties
C
Physical properties
D
Both
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Q. 109
Cooking oils contain _____
A
Saturated acids
B
Unsaturated healthy acids
C
Unsaturated fatty acids
D
Saturated healthy acids
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Q. 110
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
A
Oxidation
B
Substitution
C
Addition
D
Displacement
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Q. 111
100% pure ethanol is called
A
Denatured alcohol
B
Power alcohol
C
Rectified spirit
D
Absolute alcohol
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Q. 112
The organic compounds having functional group are known as:
A
Alcohol
B
Carboxylic acids
C
Ketone
D
Aldehyde
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Q. 113
The first member of the alkyne homologous series is:
A
ethene
B
methane
C
ethyne
D
propyne
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Q. 114
Three carbon chain with ketone functional group would name in following .
A
Propanoate
B
Propanol
C
Butanoate
D
Butanol
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Q. 115
Buckminster fullerene is an allotropic form of:
A
Sulphur
B
Tin
C
Carbon
D
Phosphorus
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Q. 116
Oils On Treating With Hydrogen In The Presence Of Palladium Or Nickel Catalyst Form Fats. This Is An Example Of:
A
Oxidation reaction
B
Displacement reaction
C
Addition reaction
D
Substitution reaction
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Q. 117
Subsequent members of homologous series differ by how many atomic mass units?
A
14
B
24
C
28
D
16
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Q. 118
Ethanol on oxidation gives
A
Ethanoic acid
B
Ethane
C
Methane
D
Formalin
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Q. 119
What is the phenomenon called when compounds have the same molecular formula but differ in physical or chemical properties?
A
Polymerization
B
Allotropy
C
Isomerism
D
Catenation
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Q. 120
Which of the given is a noble gas?
A
Hydrogen
B
Argon
C
Carbon
D
Nitrogen
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Q. 121
Which of the following compounds has the longest carbon chain?
A
Iso-pentane
B
2-methylpentane
C
2,2-dimethylbutane
D
Neopentane
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Q. 122
Graphite is lighter than diamond due to its:
A
Lower density
B
Higher density
C
Similar density
D
Variable density
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Q. 123
Diamond is primarily used for:
A
Electrical insulation
B
Lubrication
C
Cutting hard materials
D
Carbon storage
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Q. 124
The term 'Isomerism' applies to organic compounds with same:
A
structural formulae but different molecular formula.
B
empirical formula but different molecular formulae.
C
molecular formula but different structural formulae.
D
molecular formula but different empirical formulae.
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Q. 125
The number of carbon atoms surrounding each carbon atom in a diamond are:
A
2
B
3
C
5
D
4
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Q. 126
Organic compounds are generally
A
soluble in water
B
covalent in nature
C
ionic in nature
D
insoluble in organic solvents
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Q. 127
Carbon forms covalent bonds with:
A
Ionic character
B
Metallic character
C
Polar character
D
Strong sharing of electrons
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Q. 128
How many electrons are there in the outermost shell of carbon?
A
4
B
3
C
2
D
1
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