True or false — metallurgy

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   All ores are minerals, but not all minerals are ores.

2. Statement is true

   No

   Statement

   Calcination is carried out in excess supply of air.

3. Statement is true

   No

   Statement

   Carbon can reduce alumina to aluminium metal.

4. Statement is true

   Yes

   Statement

   In the thermite process aluminium reduces chromic oxide.

5. Statement is true

   Yes

   Statement

   Mercury is obtained from cinnabar by auto-reduction on roasting.