Question

Dry hydrogen gas was passed over heated lead (ii) oxide in a slanting combustion tube.
(a) state what was observed in the tube. (b) write an equation for the reaction that took place.

Answer 1

Answer:

Here is your answer

a) oxide turns from brown to grey since it is reduced to lead metal.

If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained. ... The hydrogen is gaining oxygen and is being oxidised.In other words, one reactant gets oxidised while the other gets reduced.

The balanced chemical equation with the physical state for this reaction is given below. Cu O (s) + H2 (g) ===> heat ==> Cu (s) + H2O (g).