Carbon and its Compounds Test

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Carbon and its Compounds Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Alkanes are used as fuel:

A
because there is evolution of large amount of heat during combustion.

B
because there is evolution of large amount of heat during conduction.

C
because there is evolution of large amount of heat during neutralization.

D
because there is absorption of large amount of heat during combustion.

Solution

Alkanes are used as fuel because there is the evolution of a large amount of heat during combustion. Here, the purpose is to obtain as much heat as possible from a given mass of fuel.
Question 2
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A chemical process in which a substance reacts with oxygen to give off heat is______

A
respiration

B
combustion

C
explosion

D
conduction

Solution

A chemical process in which a substance reacts with oxygen to give off heat is combustion.
For example, when C is burnt in excess air, it gives carbon dioxide and heat.
$$\displaystyle C + O_2 \rightarrow CO_2 + $$ heat
Question 3
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Use of petrol and diesel as fuel in automobiles is starting to be replaced by:

A
LPG

B
CNG

C
Bitumen

D
Coal

Solution

Use of petrol and diseal as fuel in automobiles is slowly starting to be replaced by CNG. CNG is compressed natural gas. Combustion of CNG results in fewer unwanted gases than petrol and diesel.
Question 4
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$$2C_3H_8 + 7O_2 \rightarrow 2CO_2 + 8H_2O + 2CO + 2C$$
Name the type of reaction.

A
Combustion

B
Incomplete combustion

C
Condensation

D
None of these

Solution

The reaction $$\displaystyle 2C_3H_8 + 7O_2 \rightarrow 2CO_2 + 8H_2O + 2CO + 2C$$ is an example of incomplete combustion reaction. Propane, on incomplete combustion gives carbon dioxide, water, carbon monoxide and carbon.
Question 5
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Homologous series is____________.

A
a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain.

B
a series of compounds in which different functional group substitutes for hydrogen in a carbon chain.

C
a series of compounds with same molecular formula and different structural formulae.

D
a series of compounds with same molecular formula but different functional groups.

Solution

Homologous series is a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain. The chemical properties of the compounds are very similar.

Example of a homologous series: $$CH_3OH, C_2H_5OH, C_3H_7OH, C_4H_9OH$$
Question 6
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A five carbon chain with a double bond would be named :

A
pentane

B
pentyne

C
pentone

D
pentene

Solution

For five carbon atoms, 'pent' word root is used and for double bond 'ene' suffix is used.
Hence, the name will be pentene.
Unsaturated hydrocarbons are known as alkene and alkynes.
The general formula for alkene is $$C_nH_{2n}$$.
$$n = 5$$, $$C_nH_{2n} = C_5H_{10}$$ is pentene.
Option D is correct.
Question 7
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Complete combustion of alkenes requires sufficient:

A
oxygen

B
hydrogen

C
nitrogen

D
sulphur

Solution

Complete combustion of alkene requires sufficient oxygen. Alkene on combustion in presence of sufficient oxygen will give carbon dioxide and water.
$$\displaystyle CH_2=CH_2 + 3O_2 \rightarrow 2CO_2 + 2H_2O$$
Question 8
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$$C_3H_8 + 5O_2\rightarrow 3CO_2 + H_2O$$
Name the type of reaction.

A
Double displacement reaction

B
Combustion reaction

C
Hydrogenation reaction

D
Displacement reaction

Solution

The reaction $$\displaystyle C_3H_8 + 5O_2\rightarrow 3CO_2 + H_2O$$ is an example of combustion reaction. Propane on complete combustion in presence of excess oxygen gives carbon dioxide and water.
Question 9
1 / -0

LPG is liquefied petroleum gas which is a compound of butane and propane and used as :

A
cooking fuel

B
motor fuel

C
refrigeration

D
All of these

Solution

LPG is a liquefied petroleum gas that contains butane and propane. It is used as a cooking fuel (in heating appliances, cooking equipment), motor fuel (in vehicles), and refrigeration.

Hence the correct option is D.
Question 10
1 / -0

Benzene when heated in air burns with ________ and produces $$CO_2$$ and $$H_2O$$.

A
sooty flame

B
non-sooty flame

C
light color flame

D
none of these

Solution

Benzene when heated in air burns with a sooty flame and produces $$\displaystyle CO_2 $$ and $$\displaystyle H_2O$$.
$$\displaystyle C_6H_6 + \dfrac {15}{2} O_2 \rightarrow 6CO_2 + 3H_2O$$

Note: Incomplete combustion of unsaturated hydrocarbons give sooty flame due to the presence of black unburnt carbon particles.

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Carbon and its Compounds Test - 33

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Carbon and its Compounds Test - 33

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Question 1

because there is evolution of large amount of heat during combustion.

because there is evolution of large amount of heat during conduction.

because there is evolution of large amount of heat during neutralization.

because there is absorption of large amount of heat during combustion.

Solution

Question 2

respiration

combustion

explosion

conduction

Solution

Question 3

LPG

CNG

Bitumen

Coal

Solution

Question 4

Combustion

Incomplete combustion

Condensation

None of these

Solution

Question 5

a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain.

a series of compounds in which different functional group substitutes for hydrogen in a carbon chain.

a series of compounds with same molecular formula and different structural formulae.

a series of compounds with same molecular formula but different functional groups.

Solution

Question 6

pentane

pentyne

pentone

pentene

Solution

Question 7

oxygen

hydrogen

nitrogen

sulphur

Solution

Question 8

Double displacement reaction

Combustion reaction

Hydrogenation reaction

Displacement reaction

Solution

Question 9

cooking fuel

motor fuel

refrigeration

All of these

Solution

Question 10

sooty flame

non-sooty flame

light color flame

none of these

Solution

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