GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS Set 1

Volatile stable compound ✘ Non-volatile stable compound ✘ Volatile unstable compound ✘ None of the above ✔ NULL ✔ NULL NULL

Lower the melting point of alumina and to increase the electrical conductivity ✘ Minimise the anode effect ✘ Remove impurities from alumina ✘ None of the above ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Pig iron ✘ Wrought iron ✘ Cast iron ✘ Steel ✔ NULL ✔ NULL NULL

An electric furnace ✘ A blast furnace ✘ An open hearth furnace ✘ None of these ✔ NULL ✔ NULL NULL

Fe and Ni ✘ Ag and Au ✘ Pb and Zn ✘ Se and Ag ✔ NULL ✔ NULL NULL

Carbon reduction-self reduction ✘ Self reduction-carbon reduction ✘ Electrolytic reduction-cyanide process ✘ Cyanide process-electrolytic reduction ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Liquation ✘ Floatation ✘ Electromagnetic separation ✘ Levigation ✔ NULL ✔ NULL NULL

Iron sulphide ✘ Carbon monoxide ✘ Copper(I) sulphide ✘ Sulphur dioxide ✔ NULL ✔ NULL NULL