K2MnO4 is an oxidizing agent, HCl is a reducing agent.
K2MnO4 – Potassium manganate(VI)
Other names: Potassium manganate
Appearance: Green crystals (darkening with time)
HCl – Chlorane, Hydrogen chloride
Other names: Hydrochloric acid, M, Uriatic acid
Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]