Atoms and Molecules

57. The atomicities of ozone, sulphur, phosphorus and argon are respectively :

• 8, 3, 4 and 1

• 1, 3, 4 and 8

• 4, 1, 8 and 3

• 3, 8, 4 and 1

The symbol of a metal element which is used in making thermometers is :

• Ag

• Hg

• Mg

• Sg

The Latin language name of an element is natrium. The English name of this element is :

• sodium

• potassium

• magnesium

• sulphur

The atomic theory of matter was proposed by :

• John Kennedy

• Lavoisier

• Proust

• John Dalton

One of the following elements has an atomicity of ‘one’. This element is :

• helium

• hydrogen

• sulphur

• ozone

The English name of an element is potassium, its Latin name will be :

• plumbum

• cuprum

• kalium

• natrium

The law of conservation of mass was given by :

• Dalton

• Proust

• Lavoisier

• Berzelius

The element having atomicity ‘four’ is most likely to be :

• argon

• fluorine

• phosphorus

• francium

If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively :

• 2.2 g and 1.1 g

• 1.1 g and 2.5 g

• 2.5 g and 1.1 g

• 5.0 g and 1.1 g

The law of constant proportions was given by :

• Proust

• Lavoisier

• Dalton

• Berzelius