The formula of iron (III) sulphate is

1. Fe₃SO₄
2. Fe(SO₄)₃
3. Fe₂(SO₄)₃
4. FeSO₄

In water, the hydrogen-to-oxygen mass ratio is

1. 1 : 8
2. 1 : 16
3. 1 : 32
4. 1 : 64

The correct atomic symbols for carbon, calcium, copper and cadmium respectively are:

1. Ca, C, Cu, Cd
2. Ca, C, CO, Cd
3. C, Ca, Cu, Cd
4. Ca, Cl, Co, Cd

Hydrargyrum is the Latin name of:

1. Gold
2. Silver
3. Mercury
4. Platinum