Marks
3. How would you prepare carbon dioxide, and from it a pure sample of carbon
monoxide ? (10)
Name two gases present in the exhaust fumes of a petrol engine, and explain
their presence. (4)
What is coke, and how is it manufactured ? What are the advantages of using
coke instead of coal as a fuel ? (6)
4. How would you prepare and collect sulphur dioxide ? (7)
Outline the preparation of sulphuric acid from sulphur dioxide. (7)
If only 90 per cent of the sulphur dioxide used can be converted into sulphuric
acid, what weight of sulphur is needed to produce the gas for 180 tons of
sulphuric acid ? (6)
5. How would you prepare and collect chlorine, starting from common salt ? (7)
State two common uses of this gas, and write a note on the chemistry involved
in one of those uses. (^)
How would you show the reaction of chlorine with (i) potassium bromide,
(ii) iron ? For each reaction, describe what you would see, write the equation,
and state the type of reaction.
6. (a) With the aid of a labelled sketch describe the electrolysis of water. Name
the products and the electrode at which each is liberated.
(b) Outline a method of obtaining hydrogen from water and an element.
(c) How would you show the presence of hydrogen in coal gas ?
(d) State three uses of hydrogen.
(8)
(4)
(5)
(3)
7. Draw a diagram to illustrate the structure of an atom of sodium and comment
on the valency of the element.
10 gm of an oxide of copper on reduction gave 8-9 gm of copper. Calculate
the equivalent of copper. Write the formula for this oxide.
Describe how you would carry out such an experiment.
8. How would you prepare and collect nitric acid ?
Describe the reaction of nitric acid with carbon. How would you identify
the two gaseous products ? Write a note on the oxidation and reduction ia
has occurred in this reaction.
Name two methods of preparing nitrates from nitric acid, and write an equation
showing an example of each.
(7)
(6)
(7)
(7)
(9)
(4)
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