All pure substances have:

1. the same physical state
2. the same colour
3. the same composition
4. a definite set of properties

Sugar is a compound which consists of the elements:

1. carbon and hydrogen
2. hydrogen and oxygen
3. carbon, hydrogen and oxygen
4. hydrogen, carbon and sulphur

The most abundant elements in the universe are:

1. neon and argon
2. hydrogen and helium
3. aluminium and copper
4. oxygen and nitrogen

The symbol of which of the following elements is derived from its Latin name ?

1. Cobalt
2. Copper
3. Calcium
4. Chlorine