Question

Column A column B

i) Monovalent b a. Aluminium

ii) Divalent . b. Sodium

iii) Trivalent c. Oxygen

iv) Tetravalent b d. Iron

v) Variable valency e. Carbon​

Answer 1

Answer:

1) Monovalent - Sodium

2) Divalent - Oxygen

2) Divalent - Oxygen 3) Trivalent - Aluminium

2) Divalent - Oxygen 3) Trivalent - Aluminium 4) Tetravalent - Carbon

2) Divalent - Oxygen 3) Trivalent - Aluminium 4) Tetravalent - Carbon 5) Variable valency - Iron

Explanation:

1) Sodium is Monovalent because it's valency is one. It can be written as Na^+ in its ionic form.

2)Oxygen is Divalent because it's valency is twoIt can be written as O^2- in its ionic form.

3) Aluminium is Trivalent because it's valency is three.It can be written as Al^3+ in its ionic form.

. 4) Carbon is Tetravalent because it's valency is 4 .It forms covalent bonds with different compounds. The simplest example is methane (CH4 )

5) Iron has variable valencies. it has two valencies i.e. 2 and 3.It can be written as Fe^2+ or Fe^3+ in its ionic form.