FORM 4: EXTRACTION OF METALS( Aluminium)

Sample K. C. S. E questions on extraction of Aluminium
1. Name the main ore for extraction of Aluminium(1mk)
2. Name the Impurities present in Bauxite(1mk)
3. Explain how Iron(III)oxide impurity in removed in extraction of Aluminium (3mks)
4. State two ways in which Aluminium Hydroxide can be obtained from sodium aluminate (2mks)
5. Why is Aluminium oxide reduced by electrolysis and not using carbon(1mk)
6. The melting point of Aluminium oxide is 2015⁰C .
a. What is the disadvantage of operating at this temperature (1mk)
b. Explain how the problem can solved. 2mks
c. Why is necessary to lower the mp of Aluminium oxide (1mk)
d. What would if Aluminium oxide is electrolysed at temperature
less than 950⁰C(1mk)
7. During electrolysis of molten Aluminium oxide in an Hall's cell
a. What types of electrodes are used(1mks)
b. Name two compounds that make up the electrolyte(1mk)
c. Write the Equation at the cathode(1mk)
d. Why is Aluminium ions preferentially discharged to sodium ions
at the cathode(2mks)
e. Give reasons why Aluminium is;
I) is obtained in molten state (1mk)
II) Is collected at the base of the cell(1mk)
f. Carbon anode is replaced quite often. Explain(2mks)
8. Why is it necessary to crush the ore before it is concentrated? (1mk)
9. Apart from Bauxite state the chemical name of another ore(1mk)
9. Why is Aluminium in making overhead cable(2mks)
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