Question

‘By using displacement reactions it is possible to deduce the order of reactivity of the halogens.’

Discuss this statement with reference to the elements bromine, iodine and chlorine only.

Answer 1

Step-by-step explanation:

The halogens have seven electrons in their outermost shell. Each halogen atom lacks a single electron to make their octet a complete one. Elements in the halogen group are univalent and also acceptors of electrons. They are all non-metals and oxidizing agents. The oxidizing power of the halogens decreases from top to down the group. This is why the more powerful halogens displaces a less powerful one from simple salts.

Cl₂ + 2KBr → 2KCl + Br₂

Cl₂ + 2KI → 2KCl + I₂

Br₂ + 2KI → 2KBr + I₂

I₂ + 2KCl → No reaction