Tap the process that is not concentration

Exercise and reference answers

Questions

1. Items

   1. Gravity separation
   2. Froth flotation
   3. Magnetic separation
   4. Electrolytic refining

   Reason

   Electrolytic refining purifies the metal; the others concentrate the ore.

   Odd item

   Electrolytic refining

2. Items

   1. Bauxite
   2. Roasting
   3. Calcination
   4. Smelting

   Reason

   Bauxite is an ore; the others are extraction processes.

   Odd item

   Bauxite

Instructions

Tap the odd one out.