TEST1
Click on the correct answer
1
Which of the following contain methane?
1. LPG
2. Town gas
3. Natural gas
1 and 2
2 and 3
1 and 3
all the options
2
In HK, the substance used to prepare town gas is
naphtha
petrol
kerosene
diesel oil
3
Which of the following are liquids at room temperature?
1. ethanol
2. but-1-ene
3. petrol
4. kerosene
1 and 2 only
2 and 3 only
1, 2 and 4 only
1, 3 and 4 only
4
The main constituent of natural gas is
methane
ethane
butane
hydrogen
5
Which of the following burns with the most sooty flame?
C
6
H
6
C
6
H
14
C
5
H
12
CH
4
6
Cracking is important in petroleum refineries as
It can produce alkenes
It can produce polymers
It can produce soapless detergent
It can make the smaller molecules to combine
7
A fraction from fractional distillation contains hydrocarbons with 14-25 carbon atoms in their molecules. This fraction is used as
diesel oil
petrol
wax
LPG
8
Which of the following is used as fuel for aircraft?
bitumen
naphtha
kerosene
LPG
9
Which of the following statements about methane is correct?
Its molecular formula is C
2
H
4
It is less dense than air.
It can undergo addition reaction with halogen
Its boiling point is higher than that of ethane
10
Which of the following statements about HK town gas is false?
It is made from naphtha
Hot nickel catalyst is used in its production
An odourant is added to the town gas
It contains 50% of methane
11
Which of the following statements about cracking of petroleum products is incorrect?
Cracking gives extra petrol from petroleum
Cracking is an exothermic process
Alkene can be formed in cracking
Large alkane molecules are broken down into smaller one
12
Which of the following cannot be formed from cracking of petroleum products?
CO
H
2
C
2
H
4
C
4
H
10
13
How many structural isomers are there in C
4
H
10
?
2
3
4
5
14
Fossil fuels consist mainly of carbon. But when burning in the air products other than water and carbon dioxide may form. Why?
1. There is incompletely combustion
2. There are impurities in the fuel
3. There may be combination between nitrogen and oxygen at the high temperature
1 and 2
1 and 3
2 and 3
all the options
15
Which of the following is not a renewable energy source?
Tidal energy
Biomass
Wind energy
Nuclear energy