Chromium(VI) oxide
It is a dark red crystalline solid. It is a strong oxidizing agent. It can ignite alcohol when it is mixed with it. It is very toxic and irritates skin. It is a stronger oxidizing agent than chromate. It dissolves in water to make chromic acid, which is acidic. It reacts with strong bases to make chromates. It gives off oxygen when heated and turns into chromium(III) oxide.