Question

A to F below relate to the source and extraction of either zinc or aluminium.

1. Bauxite
2. Coke
3. Cryolite
4. Froth floatation
5. Sodium hydroxide solution
6. Zinc blende

1. Write down the three letters each from the above list which are relevant to:
   1. Zinc
   2. Aluminium
2. Fill in the blanks using the most appropriate words from A to F:
   1. The ore from which aluminium is extracted must first be treated with ______ so that pure aluminium oxide can be obtained.
   2. Pure aluminium oxide is dissolved in ______ to make a conducting solution.
3. Write the formula of cryolite.

Answer 1

1. 1. B, D and F
   2. A, C and E
2. 1. The ore from which aluminium is extracted must first be treated with sodium hydroxide solution so that pure aluminium oxide can be obtained.
   2. Pure aluminium oxide is dissolved in cryolite to make a conducting solution.
3. Na₃AlF₆