Organic Chemistry Test

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Organic Chemistry Test - 1

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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.
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
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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.

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Organic Chemistry Test - 1

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Organic Chemistry Test - 1

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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

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