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Selina solutions for Class 8 Chemistry chapter 9 - Carbon and Its Compounds

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

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Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Chapter 9: Carbon and Its Compounds

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Fill in the blank

 ................. is present in both living and non-living things.

Fill in the blank.

 The tendency of an element to exist in two or more forms but in the same physical state is called ................

 Fill in the blanks

........................ and .................... are the two major crystalline allotropes of carbon.

Fill in the blank.

............. is the hardest substance that occurs naturally.

Fill in the blank.

The name ‘carbon’ is derived from the Latin word...........

Choose the correct alternative.

In combined state, carbon occurs as
(i) coal
(ii) diamond
(iii) graphite
(iv) petroleum

Choose the correct alternative.

 A crystalline form of carbon is
(i) lampblack
(ii) gas carbon
(iii) sugar
(iv) fullerene

Choose the correct alternative.

Graphite is not found in
(i) Bihar
(ii) Maharashtra
(iii) Orissa
(iv) Rajasthan

Choose the correct alternative.

Diamond is used for
(i) making the electrodes of electric furnaces.
(ii) making crucible for melting metals.
(iii) cutting and drilling rocks and glass.
(iv) making carbon brushes for electric motors.

Choose the correct alternative.

Carbon forms innumerable compounds because
(i) it has four electrons in its outermost shell.
(ii) it behaves as a metal as well as a non- metal.
(iii) carbon atoms can form long chains.
(iv) it combines with other elements to form covalent compounds.

Write ‘true’ or ‘false

Carbon constitues 0.03% of the earth’s crust.

Write ‘true’ or ‘false

Graphite is the purest form of carbon.

Write ‘true’ or ‘false’

Coloured diamonds are costlier than colourless and transparent diamonds

Write ‘true’ or ‘false’

Graphite has layers of hexagonal carbon bondings. 

Write ‘true’ or ‘false’

Diamond is insoluble in all solvents. 

 

Define

Allotropy

Define

Carat

Define 

Crystal

Define

Catenation

State the terms:

Substances whose atoms or molecules are arranged in a definite pattern. 

State the terms:

Different forms of an element found in the same physical state. 

State the terms:

The property by which atoms of an element link together to form long chain or ring compounds. 

Name the following:

A greyish black non- metal that is a good conductor of electricity. 

Name the following:

The third crystalline form of carbon. 

Answer the following question

Why is graphite a good conductor of electricity but not diamond?

Answer the following question

Why is diamond very hard?

Answer the following question

What are fullerenes? Name the most common fullerenes.

Answer the following question

What impurity is present in black diamond?

Answer the following question

Explain the softness of graphite with reference to its structure.

Give two uses of

 graphite

Give two uses of  

diamond.

Write three differences between graphite and diamond.

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Fill in the blank

.............is formed when charcoal is burnt in a limited supply of air.

Fill in the blank

Coal is a ............. form of carbon.

Fill in the blank:

......... is the most inferior form of coal.

Fill in the blank

Wood charcoal is a..........conductor of heat and electricity.

Fill in the blank

...............is used in making black shoe polish.

Choose the correct alternative

(a) Anthracite is
(i) an inferior type of coal
(ii) a superior type of coal
(iii) a cheapest form of coal
(iv) none of above

Choose the correct alternative

Destructive distillation of coal yields
(i) coal tar
(ii) coal gas
(iii) coke
(iv) all of the above

Choose the correct alternative

Lamp black is
(i) an amorphous form of carbon
(ii) a crystalline form of carbon
(iii) a pure form of carbon
(iv) a cluster of carbon atoms

Choose the correct alternative

The process by which decayed plants slowly convert into coal is called.
(i) petrification
(ii) carbonisation
(ii) carbonification
(iv) fermentation

Choose the correct alternative

The purest form of the amorphous carbon is
(i) wood charcoal
(ii) sugar charcoal
(iii) bone charcoal
(iv) lampblack

Write ‘true’ or ‘false’

Charcoal is a good adsorbent.

Write ‘true’ or ‘false

Coke is obtained by destructive distillation of sugar.

Write ‘true’ or ‘false’

ctivated charcoal is a good conductor of electricity. 

Write ‘true’ or ‘false’

 Wood charcoal is an important constituent of gun powder.

Write ‘true’ or ‘false’ 

Coal gas is used in the preparation of artificial ferilizers. 

Define 

Carbonization

Define

 Adsorption

Define

Bone black

Name the following:

Substances whose atoms or molecules are not arranged in a geometrical pattern. 

Name the following:

The best variety of coal. 

Name the following:

The purest form of amorphous carbon. 

Name the following:

An amorphous form of carbon that contains about 98% carbon. 

Name the following:

 Mixture of carbon monoxide and hydrogen. 

What is destructive distillation? What are the products formed due to the destructive distillation of coal?

 Why is wood charcoal used in water filters and gas masks?

How is wood charcoal made locally? What other substances are formed in the process.

How many carbon atoms are there in Buckminster fullerenes?

Descirbe the formation of coal ?

Name four types of coal with percentage of carbon present in each, with uses?

Name the products formed when:

wood is burnt in the absence of air.

Name the products formed when:

bone is heated in the absence of air.

Name the products formed when:
 diamond is burnt in air at 900°C.

Name the products formed when:

 graphite is subjected to high pressure and 3000°C temperature.

Give two uses for the following: 

coal

Give two uses for  the following:

coke

Give two uses for  the following:

wood charcoal

Give two uses for the following:

sugar charcoal

Give two uses for the following:

bone charcoal

Give two uses for the following:

 lampblack

Give balanced equations for the following chemical reactions:
(a) wood charcoal and cone, nitric acid
(b) coke and steam
(c) wood charcoal and lead monoxide.

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Name the chemicals required for the preparation of carbon dioxide in the laboratory.

 How will you collect the gas ?

Write the balanced chemical equation for the above reaction.

Draw a labelled diagram for the preparation of CO2 in the laboratory.

Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory ?

Write the balanced chemical equations for the preparation of carbon dioxide by:

 heating calcium carbonate.

Write the balanced chemical equations for the preparation of carbon dioxide by: 

the action of acetic acid on sodium bicarbonate.

Write the balanced chemical equations for the preparation of carbon dioxide by:

 the action of dilute sulphuric acid on sodium bicarbonate.

 

What happens when:

a lit splinter is introduced into a jar containing carbon dioxide ?

What happens when:

 moist blue litmus paper is placed in a jar containing carbon dioxide ?

What happens when:

carbon dioxide is passed through lime water first in small amounts and then in excess ?

What happens when:

 a baking mixture containing baking powder is heated?

What happens when:

a soda water bottle is opened ?

Give reasons 

An excess of carbon dioxide increases the temperature of the earth.

Give reasons

Soda acid and foam types of fire extinguisher are not used for extinguishing electrical fires.

Give reasons

Solid carbon dioxide is used for refrigeration of food.

What is a fire extinguisher ? What is the substance used in the modern type of fire extinguishers ? How is it an improvement over the soda acid-type and the foam-type fire extinguishers ?

Explain the term ‘green house effect’. How can it be both beneficial and harmful for life on earth ?

What steps should be taken to balance carbon dioxide in the atmosphere ?

State three ways by which carbon dioxide gas is added into the atmosphere.

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Fill in the blank

....................... is formed when carbon is burnt in a limited supply of air or oxygen.

Fill in the blank

 Carbon monoxide bums in air with a .............. flame to form carbon dioxide.

Fill in the blank:

Carbon monoxide is a products of..................combustion.

Fill in the blank:

 A mixture of 95% oxygen and 5% carbon dioxide is called .................

Fill in the blank:

arbon dioxide is used as a..................... in the extraction of pure metals from their corresponding ores.

Match the colunm 

       column  A         column B
1. A product of incomplete burning  a. Hopcolite     
2. Nature of carben monoxide  b. Combustible gas 
3. A compound formed by the combination of haemoglobin and carbon monoxide  c. Carboxy - haemoglobine 
4. A mixture of metallic oxides  d. Carbon monoxide 
5. Carbon monoxide  e. Highly poisonous 

How is carbon monoxide gas formed?

State the poisonous nature of carbon monoxide?

Give two uses of carbon monoxide.

Why is carbon monoxide called silent killer ?

Explain the reducing action of carbon monoxide.

Write two remedies for carbon monoxide poisoning.

Complete the reactions and balance them.
(a) CuO + CO →
(b) Fe2O2 + CO →

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Tick the most appropriate answer.

Diamond and graphite are
a. metals.
b. organic compounds,
c. alkenes.
d. allotropes.

Tick the most appropriate answer.

Each molecule of Buckminster fulierene contains 60 atoms of carbon arranged as balls consisting of 12 pentagons and
a. 20 hexagons
b. 30 hexagons
c. 40 hexagons
d. 50 hexagons

Tick the most appropriate answer.

 Which of the following is an amorphous form of carbon?

a. graphite
b. fullerenes
b. diamond
d. coal

Tick the most appropriate answer.

Which form of carbon is a good conductor of electricity?
a. graphite
b. diamond
c. coke
d. amorphous carbon

Tick the most appropriate answer.

Carbon has a great affinity for
a. sulphur
b. nitrogen
c. oxygen
d. none of these

Tick the most appropriate answer.

Fuel gases like water gas and producer gas are manufactured from
a. bone charcoal
b. wood charcoal
c. coke
d. none of these

FILL IN THE BLANK

Graphite is a good conductor of .............

FILL IN THE BLANK

Carbon atom has ................... electrons in its valence shell.

FILL IN THE BLANK

Diamond is the ............ form of carbon.

FILL IN THE BLANK

.................... is the main gaseous compound of carbon.

FILL IN THE BLANK

.............. is used to make carbon brushes in dynamos.

FILL IN THE BLANK

..................... is used as a pigment and colouring matter in ink and shoe polish.

FILL IN THE BLANK

Carbon when heated in limited supply of air forms..................

FILL IN THE BLANK

Organic compounds have ........ boiling and melting points.

FILL IN THE BLANK

.................. are the compounds of hydrogen and carbon only.

FILL IN THE BLANK

Natural gas is an important ............. fuel.

TRUE \ FALSE

Synthetic diamonds are used for cutting glass and drilling rocks.

TRUE \ FALSE

Graphite is a poor conductor of electricity.

TRUE \ FALSE

Coal can be converted to coke by destructive distillation.

TRUE \ FALSE

Buckyball is a yellow amorphous solid.

 

TRUE \ FALSE

Organic compounds are soluble in water.

TRUE \ FALSE

Pure diamond can occur in several colours.

Carbon forms innumerable compounds by combining with other elements. True or false ?

Most of our food contains compounds of carbon. True or false ?

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Name the crystalline forms of carbon.

Name the simplest organic compound.

What are hydrocarbons ? Name the two different forms of hydrocarbons.

Write the name and the chemical formula of the simplest alkene.

What is the function of activated charcoal ?

What is water gas used for ?

Name a gas which, though a compound of carbon, is not studied under organic chemistry.

What is the atomic number of carbon ?

What is the name of the famous diamond that was found in Wajrakarur in Andhra Pradesh ?

Chapter 9: Carbon and Its Compounds solutions [Page 0]

Why does diamond sparkle?

Define catenation.

State one use of each of the following:
Diamond, Graphite, Coke, Bone charcoal

How is gas carbon produced?

Write three chemical properties of carbon.

How is wood charcoal a better fuel than wood?

Chapter 9: Carbon and Its Compounds

Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Selina solutions for Class 8 Chemistry chapter 9 - Carbon and Its Compounds

Selina solutions for Class 8 Chemistry chapter 9 (Carbon and Its Compounds) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 8 Chemistry chapter 9 Carbon and Its Compounds are Allotropes of Carbon, Crystalline and Amorphous Nature of Allotropes of Carbon, Uses of Diamond, Graphite, Coke, Coal, Soot, Laboratory Preparation, Properties and Uses of Carbon Dioxide, Physical Properties of Carbon Dioxide, Chemical Properties of Carbon Dioxide, Reaction with Lime Water, Properties and Uses of Carbon Monoxide, Emphasis on Use as Reducing Agent in the Extraction of Iron, Emphasize the Harmful Properties of Carbon Monoxide When Inhaled - Asphyxia, Concept for Carbon and Its Compounds.

Using Selina Class 8 solutions Carbon and Its Compounds exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 8 prefer Selina Textbook Solutions to score more in exam.

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