Question

hydrogen does not reduce heated ​

Answer 1

Answer:

Moreover, Aluminium Oxide cannot be reduced by hydrogen even under very hot conditions because Al is more active than H. Talking about Oxides they can be reduced by hydrogen as they are below hydrogen in the reactivity series of metal.

Answer 2

Hydrogen is a good reducing agent. when hydrogen is passed over many heated metallic oxides, they are reduced to the metals. Therefore , hydrogen reduces oxides of metal the hydrogen can reduce the oxides of only those metals which are less reactive than hydrogen it selt. moveover , the metal oxide like sodium oxide, copper oxide which cannot be reduced by hydrogen.

some compounds can be both reducing and oxidizang agents. hydrogen is one of the elements that can be both reducing agent when it reacts with non-metals and an oxidizang agent when it reacts with metals.