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10th Class Chemistry Chapter 12 Hydrocarbons English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Which compound do not produce in the halogenation of methane.
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Chloroform
Carbon tetrachloride
Carbon black
Chloromethane
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Question # 2
Alkynes are also called.
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Olefine
Ethene
Paraffins
Acetylenes
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Question # 3
When bromine water is added to acetylene its red-brown colour is changed into:
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red
green
violet
discharged
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Question # 4
Boiling point of alcohol in centigrade is.
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68
78
118
128
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Question # 5
Which of one of the following is used as as fumigant:
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Ethyl alcohol
ethylene oxide
ethylene glycol
diethyl ether
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Question # 6
Which one of these is used as anaesthesia?
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carbon black
Mehtane
Ethane
Chloroform
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Question # 7
In shoe polished, which chemical is used.
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Ethanol
Methanol
Carbon black
Formaldehyde
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Question # 8
Halogenation of methane on the presence of diffused sunlight takes place.
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Only in one step
Slowly in one step
Freshly in two steps
In a series of four steps
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Question # 9
General formula of alkynes is:
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C
n
H
n
C
n
H
2n
C
n
H
2n+2
C
n
H
2n-2
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Question # 10
By which process alkenes are prepared from alcohols:
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Dehelogenation
Dehydrogenation
Dehydration
Dehydro-halogenation
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Question # 11
The reduction of alkyl halides takes place in the presence of
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Zn/HCl
Na/HCl
Mg/HCl
Cu/HCl
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Question # 12
A hydrocarbon has molecular formula C
8
H
14
. What is the molecular formula of the next number of the same homologous series.
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C
9
H
18
C
9
H
16
C
9
H
20
C
9
H
12
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Question # 13
How many percent of natural gas is consisted of methane.
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60%
70%
80%
85%
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