9th Standard Syllabus & Materials
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Published on: 25/10/2019
Carbon and its Compounds
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Questions + Answers key
Take MCQ Science Test1.
Which Amorphous form of carbon is used in making electrode in dry cell?
coke
gas carbon
lampblack
charcoal
2.
The legal measures to prevent plastic pollution come under the ___________ Protection Act 1988.
Forest
Wildlife
Environment
Human Rights
3.
Plastic resin codes are shown as three chasing arrows in a ______________ with a number in the middle or letters (an acronym of that plastic type).
Logo
Recycling symbol
Square
Triangle
4.
Graphene is one atom thick layer of carbon obtained from
Diamond
Fullerene
Graphite
Gas Carbon
5.
Graphite is used as lubricant in machines because
it is good conductor of electricity
it is made of slippery layers and has high melting point
it has high density
it is strong and soft
6.
Which of the following is highly toxic?
Carbon dioxide
Carbon monoxide
Calcium carbonate
Sodium bicarbonate
7.
Which of the following does not contain double bond
CO2
C2H4
HCl
O2
8.
Carbon forms large number of organic compounds due to
Allotropy
Isomerism
Tetravalency
Catenation
9.
The carbon atoms in fullerene are arranged in mixed
Tetragon and Pentagon
Pentagon and Hexagon
Hexagon and Heptagon
Heptagon and Octagon
10.
A phenomenon in which an element exists in different modification in same physical state is called
Isomerism
Allotropy
Catenation
Crystallinity
11.
________________ represents the type of polymer used to make the plastic.
12.
The latin word __________ meaning coal.
13.
There are ____________ plastic resin codes
14.
Buckminster Fullerene contains __________ carbon atoms.
15.
__________ named carbon.
16.
Combution
17.
Thermocol
18.
C60
19.
Andre Geim
20.
Alkyne
21.
Who is called 'Father of Modern Organic Chemistry'?
22.
How many valence electrons are there in carbon?
23.
What is burning?
24.
What is the valency of carbon in carbon monoxide?
25.
What are saturated and unsaturated compounds called?
26.
Differentiate graphite and diamond.
27.
Name the three safer resin codes of plastics and describe their features.
28.
Why do carbon exist mostly in combined state?
29.
The amorphous forms of carbon have high melting and boiling point compared to crystalline forms.
30.
Resin code 05 is considered as one of the unsafe plastics as it has harmful chemicals.
31.
Ethane is the first member of the homologous series of Alkanes.
32.
Carbon present in saturated form of Alkane where it contains single bond.
1.
(b)
gas carbon
2.
(c)
Environment
3.
(d)
Triangle
4.
(c)
Graphite
5.
(b)
it is made of slippery layers and has high melting point
6.
(b)
Carbon monoxide
7.
(c)
HCl
8.
(d)
Catenation
9.
(b)
Pentagon and Hexagon
10.
(a)
Isomerism
11.
( )
resin code
12.
( )
Carbo
13.
( )
7
14.
( )
60
15.
( )
Lavoisier
16.
Oxidation
17.
Polystyrene
18.
Bucky Ball
19.
Graphene
20.
Triple bond
21.
Friedrich Wohler
22.
Four valence electrons termed as tetravalency.
23.
Organic compounds like hydrocarbon undergo oxidation to form oxides and steam with evolution of heat and flame. This is called burning.
CH4(g)+ 2O2(g) ➝ CO2(g)+ 2H2O(g) + heat
24.
In carbon monoxide, the electron pairs of oxygen gets delocalized between C and O. So without another oxygen atom, the structure becomes stable as oxygen shares its lone pair with carbon.
i) Thus in carbon monoxide, one electron of tetravalent carbon forms sigma and other electron forms pi bond with oxygen.
ii) Then one lone pair of oxygen is shared between C and O, so that C has complete octet.
iii) Thus two unbonded electrons of C are available, so valency is 2.
Thus valency of carbon in CO is 2.
25.
| Saturated Compounds | Unsaturated Compounds |
| i) Saturated compounds are organic compounds that have only carbon - carbon single bonds. | Unsaturated compounds are organic compounds containing at least one double bond or triple bond between carbon atoms. |
| ii) Less reactive | Highly reactive |
| iii) More stable | Less stable |
| iv) Do not undergo polymerisation | undergo polymerisation |
| v) More stable | Less stable |
| vi) Includes Alkanes | Includes Alkenes, Alkynes and aromatic compounds. |
26.
| Diamond | Graphite |
| i) Each carbon has four covalent bonds | Each carbon has three covalent bonds |
| ii) Hard, heavy and transparent | Soft, slippery to touch and opaque |
| iii) It has tetrahedral units linked in three dimension | It has planar layers of hexagon units |
| iv) It is a non-conductor of heat and electricity | It is a conductor of heat and electricity |
27.
28.
1. In the Biosphere all the living things are made up of carbon compounds.
2. All the fossil fuels are also made up of carbon like hydro carbon.
3. In R biogeochemical cycle carbon is exchanged among biosphere, geosphere; hydrosphere and atmosphere of the Earth.
4. It is the main compound of nitrogen cycle, water cycle. So, it is mostly in combined state.
29.
(b)
30.
(b)
31.
(b)
32.
(a)
9th Standard Syllabus & Materials
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
