Tap the odd one out

Exercise and reference answers

Questions

1. Items

   1. Sulphur
   2. Sodium
   3. Potassium
   4. Calcium

   Reason

   Sulphur is a non-metal; the others are metals.

   Odd item

   Sulphur

2. Items

   1. Copper
   2. Oxygen
   3. Iron
   4. Zinc

   Reason

   Oxygen is a gas/non-metal; the others are metals.

   Odd item

   Oxygen

3. Items

   1. Combination
   2. Decomposition
   3. Evaporation
   4. Displacement

   Reason

   Evaporation is a physical change; the others are chemical reactions.

   Odd item

   Evaporation

Instructions

Tap the odd one out.