Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Bismuth
   2. Nitrogen
   3. Phosphorus
   4. Head of group

   Odd item

   Bismuth

2. Items

   1. Chile saltpetre
   2. Indian saltpetre
   3. Apatite rock
   4. Air at 78

   Odd item

   Apatite rock

3. Items

   1. Minus three
   2. Plus three
   3. Plus five
   4. Plus seven

   Odd item

   Plus seven

4. Items

   1. Colourless
   2. Odourless
   3. Tasteless
   4. Very toxic

   Odd item

   Very toxic

Instructions

Tap the item that does not belong with the rest.

Explanation