Question

what is complex compounds
8th std​

Answer 1

Answer:

-A complex compound can be described as a class of substances with a chemical structure where the central atom is a metal and is surrounded by non-metal atoms or a group of atoms (or ligands). Both the central atom and ligands are joined by chemical bonds like a covalent bond, ionic bonds, coordinate bond.

- Complex compound is also called a coordinate compound as it contains the coordinate bonds in its structure. Complex compounds show geometrical and optical isomerism.

Werner’s theory:

-The central metal atom of a complex compound shows two types of valency – primary and secondary.

-The primary valency describes the oxidation state of the central metal atom and the secondary valency describes the coordination number of the complex compound.

-The coordination number of a complex compound is fixed – it means the secondary valency is fixed for every metal atom.

-A negative ion of a complex compound satisfies the primary valency. On the other hand, secondary valency is satisfied by the positive ions.

The secondary valency tells us about the geometric structure of a complex compound.