Which one does not belong

Exercise and reference answers

Questions

1. Items

   1. Metre
   2. Litre
   3. Kilogram

   Odd item

   Litre

2. Items

   1. Air
   2. Tea
   3. Pure water

   Odd item

   Pure water

3. Items

   1. Astronomy
   2. Alchemy
   3. Iatrochemistry

   Odd item

   Astronomy

4. Items

   1. Mole
   2. Melody
   3. Molarity

   Odd item

   Melody

Instructions

Tap the item that does not fit with the others.

Explanation