Organic Chemistry Test

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Organic Chemistry Test - 7

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Weekly Quiz Competition

Question 1
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Which of the following is incorrect?

A
Graphite can be converted to diamond.

B
Charcoal, coke and carbon black are all different forms of graphite.

C
CO₂ can be evolved from graphite, but not from diamond.

D
The elements carbon and sulphur react chemically to form the compound carbon disulphide.

Solution

Diamond is an allotrope of carbon which was first confirmed by the English chemist Smithson Tennant, who was the first to burn a diamond in air producing carbon dioxide. Thus, according to this statement, option (3) is incorrect.
Question 2
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Lamp black, an amorphous form of carbon is prepared by

A
heating kerosene oil in a limited supply of air

B
heating wood in excess of air

C
destructive distillation of coal

D
heating coal in excess of air

Solution

Lamp black, an amorphous form of carbon, is prepared by heating kerosene oil in a limited supply of air.
Question 3
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Consider the following statements regarding graphite.

I. It is an allotrope of carbon.
II. It is a good conductor of heat and electricity.
III. It can be artificially produced.

Of these statements, which of the following are correct?

A
I, II and III are correct.

B
I and II are correct.

C
I and III are correct.

D
II and III are correct.

Solution

All the given statements are correct because graphite is an allotrope of carbon, which is a good conductor of heat and electricity and can also be produced artificially.
Question 4
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Which of the following substances is used as a lubricant?

A
Silica

B
Graphite

C
Diamond

D
Iron oxide

Solution

Graphite is an allotropic form of carbon which can be used as a lubricant.
Question 5
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Which of the following is an essential element in all organic compounds?

A
Nitrogen

B
Sulphur

C
Carbon

D
Oxygen

Solution

Carbon is an essential element in all organic compounds.
Question 6
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Which of the following substances is the hardest?

A
Silver

B
Diamond

C
Gold

D
Platinum

Solution

Diamond is the hardest known substance.
Question 7
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Graphite is a good conductor of electricity due to the presence of

A
mobile electrons

B
bonded electrons

C
strong C-C bonds

D
none of the above

Solution

Graphite is a good conductor of electricity due to the presence of mobile (free) electrons.
Question 8
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The allotropic form of carbon known as charcoal

A
is amorphous

B
consists of micro-crystals of graphite

C
consists of micro-crystals of diamond

D
is lighter than water

Solution

There are two allotropic forms of carbon.
(1) Crystalline form: There are three crystalline forms of carbon: diamond, graphite and bucky ball.
(2) Amorphous form: There are various amorphous forms of carbon: coal, coke, charcoal, lampblack, gas carbon, etc.
Question 9
1 / -0

Graphite is used as a lubricant because

A
it is crystalline

B
it consists of layers, which readily slip over one another

C
it is non-crystalline

D
none of the above

Solution

Graphite is used as a lubricant because it consists of layers which readily slip over one another.
Question 10
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Heterocyclic compounds have a ring comprising of 'O', 'S' or 'N' atoms along with carbon atoms.

Pyridine is a heterocyclic compound comprising of a 6 membered ring of

A
2 nitrogen atoms and 4 carbon atoms

B
1 oxygen atom and 5 carbon atoms

C
2 oxygen atoms and 4 carbon atoms

D
1 nitrogen atom and 5 carbon atoms

Solution

Pyridine is a heterocyclic compound as it is a cycle that does not only contain carbon atoms, but also nitrogen. The structure of pyridine is as follows.
Question 11
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Which of the following is used as a material for making protective windows in space probes?

A
Tungsten

B
Steel

C
Graphite

D
Diamond

Solution

Diamond is used as a material for making protective windows in space probes.
Question 12
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Which of the following is an odd compound?

A
Butane

B
Propene

C
Acetylene

D
Ethene

Solution

The compound given in option (1) is a saturated compound. Rest all the compounds are unsaturated. Thus, option (1) is the odd one out.
Question 13
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Why do carbon compounds have low boiling points?

A
Due to weak intra-molecular forces

B
Due to weak inter-molecular forces

C
Due to strong inter- particle forces

D
Due to strong inter-molecular forces

Solution

Carbon compounds have low boiling points because of the weak inter-molecular forces.
Question 14
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Which of the following is a characteristic feature of organic compound?

A
Low melting point

B
High melting point

C
Soluble in polar solvents

D
Insoluble in polar solvents

Solution

Organic compounds have low melting points.
Question 15
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Which of the following statements explains why the carbon forms so many compounds?

A
Carbon atoms combine readily with oxygen.

B
Carbon atoms have very high electro negativity.

C
Carbon atoms have low melting and boiling points.

D
Carbon readily forms covalent bonds with the other carbon atoms.

Solution

Carbon forms so many compounds because carbon readily forms covalent bonds with other carbon atoms.
Question 16
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Which of the following allotropic forms of carbon can be made synthetically?

A
Graphite

B
Fullerene

C
Coal

D
Diamond

Solution

Diamond, graphite, and other forms of carbon are taken directly from mines in the earth. Diamond and graphite can also be made in laboratories. Synthetic diamonds, for example, are made by placing pure carbon under very high pressures (about 800,000 pounds per square inch) and temperatures (about 2,700°C). The carbon is heated and squeezed in the same way organic material is heated and squeezed in the earth. Today, about a third of all diamonds used are synthetically produced.
Question 17
1 / -0

Which of the following is not an organic compound?

A
CaCO₃

B
CH₃COOH

C
HCOOH

D
H₃C-CO-CH₃

Solution

Compounds of carbon are classified as organic when carbon is bound to hydrogen. Carbon compounds such as carbides (e.g. silicon carbide [SiC₂]), some carbonates (e.g. calcium carbonate [CaCO₃]), some cyanides (e.g. sodium cyanide [NaCN]), graphite, carbon dioxide, and carbon monoxide are classified as inorganic.
Question 18
1 / -0

Which of the following is not a characteristic of carbon?

A
Tetravalency

B
Catenation

C
Conduction of electricity

D
Unstable covalent bonding

Solution

Unstable covalent bonding is not a characteristic of carbon because it forms stable covalent bonds with other elements.
Question 19
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Which of the following bonds is most stable?

A
C – C

B
C – H

C
C – O

D
Si – Si

Solution

C – C bond is the most stable covalent bond among all the given bonds.
Question 20
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Which of the following is a major constituent of LPG?

A
Methane

B
Octane

C
Butane

D
Ethane

Solution

The composition roughly is: about 55% butane and 45% propane with traces of iso-pentane and olefins.
Thus, butane is the major constituent of LPG.

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Organic Chemistry Test - 7

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Question 1

Graphite can be converted to diamond.

Charcoal, coke and carbon black are all different forms of graphite.

CO2 can be evolved from graphite, but not from diamond.

The elements carbon and sulphur react chemically to form the compound carbon disulphide.

Solution

Question 2

heating kerosene oil in a limited supply of air

heating wood in excess of air

destructive distillation of coal

heating coal in excess of air

Solution

Question 3

I, II and III are correct.

I and II are correct.

I and III are correct.

II and III are correct.

Solution

Question 4

Silica

Graphite

Diamond

Iron oxide

Solution

Question 5

Nitrogen

Sulphur

Carbon

Oxygen

Solution

Question 6

Silver

Diamond

Gold

Platinum

Solution

Question 7

mobile electrons

bonded electrons

strong C-C bonds

none of the above

Solution

Question 8

is amorphous

consists of micro-crystals of graphite

consists of micro-crystals of diamond

is lighter than water

Solution

Question 9

it is crystalline

it consists of layers, which readily slip over one another

it is non-crystalline

none of the above

Solution

Question 10

2 nitrogen atoms and 4 carbon atoms

1 oxygen atom and 5 carbon atoms

2 oxygen atoms and 4 carbon atoms

1 nitrogen atom and 5 carbon atoms

Solution

Question 11

Tungsten

Steel

Graphite

Diamond

Solution

Question 12

Butane

Propene

Acetylene

Ethene

Solution

CO₂ can be evolved from graphite, but not from diamond.

CaCO₃

CH₃COOH

H₃C-CO-CH₃