Tap the item that does not belong

Exercise and reference answers

Questions

1. Items

   1. Roasting
   2. Distillation
   3. Liquation
   4. Zone refining

   Reason

   Roasting is an extraction step; the others are refining methods.

   Odd item

   Roasting

2. Items

   1. Galena
   2. Bauxite
   3. Zinc blende
   4. Copper pyrite

   Reason

   Bauxite is an oxide ore; the others are sulphide ores.

   Odd item

   Bauxite

3. Items

   1. Mond process
   2. Van Arkel
   3. Froth flotation
   4. Zone refining

   Reason

   Froth flotation is concentration; the others are refining methods.

   Odd item

   Froth flotation

Instructions

Tap the odd one out.