Spot the intruder

Exercise and reference answers

Questions

1. Items

   1. Ammonium
   2. Calcium
   3. Potassium
   4. Nitrate

   Odd item

   Nitrate

2. Items

   1. Clay
   2. Humus
   3. Colloid
   4. Quartz sand

   Odd item

   Quartz sand

3. Items

   1. Addition
   2. Substitution
   3. Elimination
   4. Distillation

   Odd item

   Distillation

Instructions

Three belong together. Tap the one that does not.