Std 9 science chapter 13 carbon : An important element question answer |Exercise Class 9 ch13
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Exercise class 9 ch13
Std 9 science chapter 13 carbon : An important element question answer
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Exercise class 9 science chapter 13 carbon an important element, Question answer class 9 science, Question answer carbon an important element, Exercise carbon an important element, Carbon an important element, Std 9 science chapter 13,
Select the proper option and complete
the statements
(single, all, double, ionic, carbon, give
and take, hydrogen, multiple, share,
most, covalent)
a. A carbon atom forms a …… bond
with other atoms. In this bond the
two atoms ….electrons.
b. All the carbon bonds in a saturated
hydrocarbon ....…. electrons.
c. At least one carbon bond in an
unsaturated hydrocarbon is ….
d. ….. is the essential element in all
the organic compounds.
e. The element hydrogen is present in
….. organic compound.
2. Answer the following questions
a. Why are carbon and its compounds
used as fuels?
b. In which compound forms does
carbon occur?
c. Write the uses of diamond.
3. Explain the difference:
a. Diamond and graphite.
b. Crystalline and non-crystalline
forms of carbon.
4. Write scientific reasons
a. Graphite is a conductor of electricity.
b. Graphite is not used in ornaments.
c. Limewater turns milky when CO2
is passed through it.
d. Biogas is an eco-friendly fuel.
5. Explain the following.
a. Diamond, graphite and fullerenes
are crystalline forms of carbon.
b. Methane is called marsh gas.
c. Petrol, diesel, coal are fossil fuels.
d. Uses of various allotropes of carbon.
e. Use of CO2
in fire extinguisher.
f. Practical uses of CO2.
6. Write two physical properties each.
a. Diamond
b. Charcoal
c. Fullerene
7. Complete the following Chemical
reactions.
1. ........+.......® CO
2
+ 2H
2
O + Heat
2. ...........+.........® CH
3
Cl + HCl
3. 2 NaOH + CO
2
®.
.......+........
8. Write answers to the following in
detail.
a. What are the different types of coal?
What are their uses?
b. How will you prove experimentally
that graphite is good conductor of
electricity?
c. Explain the properties of carbon.
d. Classify carbon.
9. How will you verify the properties of
carbon dioxide?
Project
Make a model of a biogas plant and
make a presentation in the class about
the process of gas production.
Exercises
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