Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Calcium carbonate
   2. Displacement
   3. Disproportionation
   4. Combination

   Odd item

   Calcium carbonate

2. Items

   1. Peroxide
   2. Superoxide
   3. Oxide
   4. Chloride

   Odd item

   Chloride

3. Items

   1. Loss of electrons
   2. Oxidation
   3. Number goes up
   4. Gain of electrons

   Odd item

   Gain of electrons

4. Items

   1. Sodium
   2. Magnesium
   3. Aluminium
   4. Hydrogen

   Odd item

   Hydrogen

Instructions

Tap the item that does not belong with the rest.

Explanation