Question

Example of an oxidising agent not containing oxygen

Answer 1

2HCl + 2Na → 2NaCl + H₂

In this, the hydrochloric acid was the oxidising agent. The sodium atoms donated an electron to the hydrogen ions to make them hydrogen atoms, making HCl the oxidising agent.

The confusion likely stems from different definitions of oxidation. In this context, oxidation means the loss of electrons, and oxygen, despite the name, has nothing to do with it.

Answer 2

the answer to your question is
Manganese dioxide
Red lead
Lead dioxide
Potassium Permanganate
Bleaching powder.
Hydrogen Peroxide
Bromine
Ozone
Chlorine