Balbharti Maharashtra State Board Class 9 Science MCQ Solutions Chapter 13. Carbon : An important element
1) Identify the wrong pair
Which of the following are not the uses of Methane?
A ) Used in fabric mills
B ) Used as a domestic fuel
C ) Used as an industrial fuel
D ) Used in the production of acetylene
Ans C ) Used as an industrial fuel
2) The crystalline form of Carbon has low melting points.
A ) True
B ) False
Ans B ) False
3) Carbon dioxide gas supports combustion.
A ) True
B ) False
Ans B ) False
4) The thermal conductivity of Diamond is ……………
A ) Poor
B ) Very poor C ) Excellent D ) Moderate
Ans C ) Excellent
5) Compounds obtained directly or indirectly from plants and animals are called compounds.
A ) Organic
B ) Inorganic
Ans A ) Organic
6) are compounds of carbon and hydrogen.
A ) Carbon
B ) Hydrogen
C ) Oxygen
D ) Hydrocarbon
Ans D ) Hydrocarbon
7) A Double bond between two carbon atoms is stronger than a single bond between two carbon atoms.
A ) True
B ) False
Ans B ) False
8) Methane is also called maargsahing. as.
A ) True
B ) False
Ans A ) True
9) Covalent compounds have high melting points.
A ) True
B ) False
Ans B ) False
10) The natural source of hydrocarbons is ……………
A ) Gel
B ) Suspension
C ) Crude oil
D ) Diesel
Ans C ) Crude oil
11) When ethanoic acid reacts with to form salt and water.
A ) Acid
B ) Neutral
C ) Base
D ) Carbon
Ans C ) Base
12) Nickel is used as catalyst in the reaction of hydrogen and carbon monoxide.
A ) True
B ) False
Ans A ) True
13) The atomic number of Carbon is ……………
A ) 2
B ) 4
C ) 6
Ans C ) 6
14) The substance that is used in the production of water gas and producer gas.
A ) Coke
B ) Charcoal
C ) Coal
Ans A ) Coke
15) Liquid Carbon dioxide is used as a solvent in dry cleaning.
A ) True
B ) False
Ans A ) True
16) The atomic mass of Carbon is ……………
A ) 6
B ) 8
C ) 12
Ans C ) 12
17) is the main element in the cellular DNA and RNA that transfer hereditary characteristics.
A ) Carbon
B ) Oxygen
C ) Hydrogen
Ans A ) Carbon
18) Hydrocarbons having double or triple covalent bonds between the carbon atoms; are called ……………
A ) Aromatic Hydrocarbon
B ) Simplest Hydrocarbon
C ) Unsaturated Hydrocarbon
D ) Saturated Hydrocarbon
Ans C ) Unsaturated Hydrocarbon
19) The first example of fullerene is Buck minster fullerene.
A ) True
B ) False
Ans A ) True
20) The compound formed when CO2 reacts with Sodium carbonate.
A ) NaHCO3
B ) Na2CO3
Ans A ) NaHCO3
21) All organic compounds contain carbon.
A ) True
B ) False
Ans A ) True
22) Carbon dioxide based fire extinguishers do not cause corrosion.
A ) True
B ) False
Ans A ) True
23) The lead used in pencil is made by mixing graphite with clay.
A ) True
B ) False
Ans A ) True
24) Coke is used as a reducing agent.
A ) True
B ) False
Ans A ) True
25 ) CH2Cl2 is named as ………….. .
A ) Chloromethane B ) Dichloromethane C ) Methane chloride D ) Methyl chloride
Ans B ) Dichloromethane
26) The atomic number of carbon is ……………
A ) 5
B ) 7
C ) 11
D ) 6
Ans D ) 6
27) The valency of Carbon is ……………
A ) 2
B ) 4
C ) 6
Ans B ) 4
28) A substance that exhibits superconductivity at a certain temperature.
A ) Graphite B ) Fullerene C ) Coal
Ans B ) Fullerene
29 ) CHCI3 is named as ………….. .
A ) Chloroform
B ) Chloromethane C ) Chloro methyl D ) Chloro-m
Ans A ) Chloroform
30) In Methane, carbon atom shares one electron each with four hydrogen atoms.
A ) True
B ) False
Ans A ) True
31) Diamond dissolves in organic solvents.
A ) True
B ) False
Ans B ) False
32) The molecular formula of Methane is ……………
A ) CH4 B ) C2H4 C ) CH3
Ans A ) CH4
33) The Methanogenic bacteria act on the organic acids to produce methane gas.
A ) True
B ) False
Ans A ) True
34) The melting point of diamond is 3500°C. A ) True
B ) False
Ans A ) True
35) The type of coal that contains 60 to 70% of carbon.
A ) Peat
B ) Lignite
C ) Anthracite
Ans B ) Lignite
36) Carbon compounds are also called compound.
A ) Covalent
B ) Ionic
Ans A ) Covalent
37) Fractional distillation of natural gas gives methane in pure form.
A ) True
B ) False
Ans A ) True
38) In , every carbon atom is bonded to four neighboring atoms.
A ) Diamond
B ) Graphite
Ans A ) Diamond
39) shows allotropy.
A ) Methane
B ) Carbon dioxide
C ) Carbon
D ) Chlorine
Ans C ) Carbon
40) A solution of 5% to 8% ethanoic acid in water is called …………… .
A ) Gel
B ) Benzene C ) Vinegar D ) Ethanol
Ans C ) Vinegar
41) Ethanoic acid reacts with ethanol to form the …………… .
A ) Ether B ) Ketone C ) Ester
D ) Aldehyde
Ans C ) Ester
42) The density of Carbon dioxide is more than the density of air.
A ) True
B ) False
Ans A ) True
43) Name the substance formed when Carbon reacts with Oxygen.
A ) Carbon monoxide
B ) Carbon dioxide
Ans B ) Carbon dioxide
44) The name for Covalent bond is bond.
A ) Polar
B ) Isolated C ) Network D ) Molecular
Ans D ) Molecular
45) Carbon dioxide based fire extinguishers are good conductors of electricity.
A ) True
B ) False
Ans B ) False
46) Carbon dioxide is present as a salt in chalk.
A ) True
B ) False
Ans A ) True
There was an error starting the application. Please try
47) Carbon is a non-metallic element.
again.
A ) True
B ) False
Ans A ) True
48) Hydrochloric acid is used in fire extinguishers.
A ) True
B ) False
Ans B ) False
49) Decomposition of organic matter by aerobic process produces methane.
A ) True
B ) False
Ans B ) False
50) is the simplest hydrocarbon.
A ) Ethane B ) Pentane C ) Hexane D ) Methane
Ans D ) Methane
51) Blue litmus turns red indicating that Carbon dioxide gas is basic in nature.
A ) True
B ) False
Ans B ) False
52) The reaction between carboxylic acid and alcohol to form an ester is called …………… .
A ) Etherification B ) Esterification C ) Saponification
D ) Combustification
Ans B ) Esterification
53) …………… and are allotropy forms of carbon.
A ) Silver, Diamond
B ) Tin, Diamond
C ) Diamond, Graphite
D ) Tin, Graphite
Ans C ) Diamond, Graphite
54) The alternating single and double bond hydrocarbons form a ring. Such hydrocarbon is called …………… .
A ) Alternate hydrocarbon
B ) Hydrocarbon
C ) Aromatic hydrocarbon
D ) Aliphatic hydrocarbon
Ans C ) Aromatic hydrocarbon
55) Which gas in the air reacts with the coal on igniting?
A ) Oxygen
B ) Hydrogen
C ) Carbon dioxide
Ans A ) Oxygen
56) reacts with sodium to form sodium ethoxide.
A ) Methanol B ) Acetic acid C ) Ketone
D ) Ethanol
Ans D ) Ethanol
57) The structure of C70 fullerene resembles the structure of geodesic dome.
A ) True
B ) False
Ans B ) False
58) Name the solvent in which the Carbon compounds are soluble.
A ) Organic
B ) Inorganic
Ans A ) Organic
59) When Ethyl ethanoate reacts with sodium hydroxide; sodium acetate and ethanol is formed. such a reaction is called …………… .
A ) Esterification B ) Saponification C ) Acid
D ) Etherification
Ans B ) Saponification
60) Carbon forms …………… chain and chain compounds.
A ) Long, branched
B ) Cycle, long
C ) Branched, cycle
D ) Order, long
Ans A ) Long, branched
61) Coal contains nitrogen, phosphorus and sulphur.
A ) True
B ) False
Ans A ) True
62) The crystalline form of Carbon has an irregular arrangement of atoms.
A ) True
B ) False
Ans B ) False
63) Carbon forms a bond.
A ) Ionic
B ) Non polar C ) Covalent D ) Liquid
Ans C ) Covalent
64) Biogas contains about 60% of carbon dioxide and the rest is methane.
A ) True
B ) False
Ans B ) False
65) The type of coal that contains a high proportion of water and less than 60% of carbon.
A ) Peat
B ) Lignite
C ) Anthracite
Ans A ) Peat
66) CHCI3 + Cl2 → + HCl
A ) CH3Cl B ) C2H6 C ) CCl4 D ) CHCI3
Ans C ) CCl4
67) The German chemist Wohler synthesized an organic compound urea.
A ) True
B ) False
Ans A ) True
68) Molecules of fullerene are found in the form of buckyballs and buckytubes.
A ) True
B ) False
Ans A ) True
69) Diamond heated in air gives gas.
A ) Methane
B ) Carbon dioxide
C ) Carbon
D ) Nitrogen
Ans B ) Carbon dioxide
70) Name the element whose allotropic form is diamond.
A ) Carbon
B ) Coal
C ) Charcoal
Ans A ) Carbon
71) The reaction of Calcium carbonate and hydrochloric acid can obtain carbon dioxide.
A ) True
B ) False
Ans A ) True
72) Organic acid is produced by the action of microbes on the biodegradable complex organic compounds.
A ) True
B ) False
Ans A ) True
73) In the combined state, Carbon exists in the form of carbonates.
A ) True
B ) False
Ans A ) True
74) The density of Graphite is cm3.
A ) 2.250
B ) 1.9 – 2.3g/cm3
C ) 3.510
D ) 3.010
Ans B ) 1.9 – 2.3g/cm3
75) The gas used to make aerated drinks.
A ) CO2
B ) CO
Ans A ) CO2
76) Which of the following is not the property of Methane?
A ) Colorless gas
B ) Sparingly soluble in water
C ) Gaseous at room temperature
D ) Denser than water
Ans D ) Denser than water
77) In different forms of the same elements are chemically identical, but they differ in their physical properties.
A ) Isomers B ) Allotropy C ) Isobars D ) Valency
Ans B ) Allotropy
78) Methane undergoes substitution reaction with in the presence of sunlight.
A ) Oxygen B ) Chlorine C ) Carbon
D ) Carbon monoxide
Ans B ) Chlorine
79) The atomic mass of carbon is ……………
A ) 15
B ) 12
C ) 17
D ) 16
Ans B ) 12
80) The substance used for getting special effects of a mist in dramas and movies.
A ) CO2
B ) CH4
Ans A ) CO2
81) The compound formed when CO2 reacts with Sodium hydroxide.
A ) NaHCO3
B ) Na2CO3
Ans B ) Na2CO3
82) Production of biogas is an aerobic process.
A ) True
B ) False
Ans B ) False
83) Carbon is found in …………… and state.
A ) Combined and free B ) Solid and combined C ) Gas and free
D ) Free and solid
Ans A ) Combined and free
84 ) There was an error starting the application. Please try
Plants use oxygen in the air for photosynthesis.
A ) True
B ) False
Ans B ) False
again.
85) Carbon dioxide gas is obtained by the upward displacement of air.
A ) True
B ) False
Ans A ) True
86) The electronic configuration of Neon is …………… .
A ) 2, 8
B ) 2
C ) 2, 6
Ans A ) 2, 8
87) Carbon dioxide based fire extinguishers are used to extinguish big scale fire.
A ) True
B ) False
Ans B ) False
88) Name the gas that turns freshly prepared lime water milky.
A ) CO2
B ) CO
C ) O2
Ans A ) CO2
89) Graphite does not dissolve in most solvents.
A ) True
B ) False
Ans A ) True
90) is an example of Aromatic Hydrocarbon.
A ) Nonane B ) Hexyne C ) Benzene
D ) Cycloheptane
Ans C ) Benzene
91) Methane and chlorine gases react with each other in presence of ultra violet light to form methyl chloride.
A ) True
B ) False
Ans A ) True
92) acts as catalyst in addition reaction.
There was an error starting the application. Please try
A ) Carbon
B ) Palladium or Ni
C ) Gold
D ) Copper
Ans B ) Palladium or Ni
again.
93) Carbon shows valency.
A ) Octa B ) Penta C ) Tri D ) Tetra
Ans D ) Tetra
94) Graphite has a layered structure.
A ) Tetragonal
B ) Hhexagonal
Ans B ) Hhexagonal
95) Methane burns completely with oxygen to give a greenish flame.
A ) True
B ) False
Ans B ) False
96) are oxidized to Carboxylic acids.
A ) Phenols B ) Alkanes C ) Alcohols D ) Gas
Ans C ) Alcohols
97) Biogas is a fuel which is convenient to use.
A ) True
B ) False
Ans A ) True
98) Manure is the side product in the Biogas plant.
A ) True
B ) False
Ans A ) True
99) Diamond is a conductor of electricity.
A ) Good
B ) Bad
Ans B ) Bad
There was an error starting the application. Please try
100) ………………….is the melting point of Carbon dioxide.
A ) -56.50C B ) -560C C ) -56.60C
Ans C ) -56.60C
101) The substance that is used in thermal power plants for generation of electricity.
A ) Coke
B ) Charcoal
C ) Coal
Ans C ) Coal
102) is good conductor of electricity.
A ) Diamond B ) Fullerenes C ) Graphite D ) Silicon
Ans C ) Graphite
103) Fullerene is rarely found in nature.
A ) True
B ) False
Ans A ) True
104) Methane gas is also called as Biogas.
A ) True
B ) False
Ans A ) True
105) is used in glass cutting and rock drilling machines.
A ) Diamond
B ) Graphite
Ans A ) Diamond
106) Carbon dioxide is an odorless and colorless gas.
A ) True
B ) False
Ans A ) True
107) occur in free State in soot and interstellar space.
A ) Copper
B ) Turmeric
C ) Fullerenes
D ) Ammonia
Ans C ) Fullerenes
108) is used for making alcoholic drinks.
A ) Ethanol
B ) Benzene
C ) Cyclohexane
D ) Sulphuric acid
Ans A ) Ethanol
109) The density of graphite is 1.9 to 2.3g/cm3.
A ) True
B ) False
Ans A ) True
110) Covalent compounds are poor conductors of heat and electricity.
A ) True
B ) False
Ans A ) True
111) Carbon has valence electrons.
A ) 4
B ) 6
C ) 8
D ) 2
Ans A ) 4
112) Diamond knives are used in eye surgery.
A ) True
B ) False
Ans A ) True
113) Carbon forms ring compounds.
A ) Straight B ) Double C ) Closed
D ) Unknown
Ans C ) Closed
114 ) CH3COOH + NaHCO3 →…………… + H2O + CO2 ↑
A ) CH3COOC2H5
B ) CH3COONa C ) CH3COOH D ) CH3COO
Ans B ) CH3COONa
115) The elements sulphur and phosphorus also exhibit allotropy.
A ) True
B ) False
Ans A ) True
116) Carbon atom can form bonds with other carbon atoms to form long chains, branched chains and closed rings. This property is called …………… .
A ) Anneation B ) Catenation C ) Ionization
D ) Chemical reaction
Ans B ) Catenation
117) Biogas is also used for production of electricity.
A ) True
B ) False
Ans A ) True
118) The density of Diamond is cm3.
A ) 2.250
B ) 2.510
C ) 3.5
D ) 3.050
Ans C ) 3.5
119) Acids / bases have no effect on diamond.
A ) True
B ) False
Ans A ) True
120) Carbon forms large number of ……………
A ) Simple
B ) Compounds
C ) Aroma
D ) Complexes
Ans B ) Compounds
121) Name the hardest natural substance known.
A ) Iron
B ) Steel
C ) Diamond
Ans C ) Diamond
122) Name the gas released during the combustion of fossil fuels.
There was an error starting the application. Please try
A ) CO2
B ) CO
C ) O2
Ans A ) CO2
123) The element Carbon occurs in free as well as in the combined state in nature.
A ) True
B ) False
Ans A ) True
124) molecule has four hydrogen atoms linked to one carbon atom.
A ) Propane B ) Octane C ) Methane D ) Ethane
Ans C ) Methane
125) The Electronic arrangement of Carbon is ……………
A ) 2,6
B ) 2,4
C ) 2,8
D ) 2,1
Ans B ) 2,4
126) …………… and is an example of Saturated Hydrocarbon.
A ) Propane and ethane B ) Ethene and Propane
C ) Pentyne and Benzene D ) Benzene and Pentyne
Ans A ) Propane and ethane
127) Ethene undergoes reaction with hydrogen to form ethane.
A ) Substraction B ) Combustion C ) Oxidation D ) Addition
Ans D ) Addition
128) The addition of hydrogen to unsaturated hydrocarbons to form saturated hydrocarbons is called …………… .
A ) Halogenation
B ) Oxidation
C ) Hydrogenation
D ) Reduction
Ans C ) Hydrogenation
129) Graphite is a good conductor of electricity.
A ) True
B ) False
Ans A ) True
130) Methane is found in coal mines.
A ) True
B ) False
Ans A ) True
131) has a strong odour / sweet smell.
A ) Methane B ) Ethene C ) Benzene
D ) Cyclopropane
Ans C ) Benzene
132) Carbon has three crystalline allotropes.
A ) True
B ) False
Ans A ) True
133) The substance formed when CO2 reacts with water.
A ) Carbonic acid
B ) Sulphuric acid
Ans A ) Carbonic acid
134) State the molecular mass of Carbon dioxide.
A ) 44
B ) 46
C ) 42
Ans A ) 44
135) One layer of graphite is called ……………
A ) Graphene
B ) Grapheme
Ans A ) Graphene
136) Graphite is found in soot and in interstellar space.
A ) True
B ) False
Ans B ) False
137) is chemically unique.
There was an error starting the application. Please try
A ) Nitrogen B ) Carbon C ) Oxygen D ) Hydrogen
Ans B ) Carbon
138) Diamond has a tetragonal two-dimensional structure.
A ) True
B ) False
Ans B ) False
139) The pure form of coal contains about 95% of carbon.
A ) Peat
B ) Lignite
C ) Anthracite
Ans C ) Anthracite
140) The electronic configuration of Carbon is ……………
A ) 2, 4
B ) 2, 5
C ) 2, 6
Ans A ) 2, 4
141) Liquefied Carbon dioxide is used to remove caffeine from coffee.
A ) True
B ) False
Ans A ) True
142) The valency of Carbon is ……………
A ) 4
B ) 6
C ) 8
Ans A ) 4
143) Graphite is used as insulators.
A ) True
B ) False
Ans B ) False
144) Covalent compounds are insoluble in water.
A ) True
B ) False
Ans A ) True
145) Graphite is everywhere found in nature.
A ) True
B ) False
Ans B ) False
again.
146) Fullerenes are soluble in Chlorobenzene.
A ) True
B ) False
Ans A ) True
147) The compounds formed from only carbon and hydrogen are called basic organic compounds.
A ) True
B ) False
Ans A ) True
