Question

When dry hydrogen is passed over lead(2)oxide a grayish solid J was obtained identify J

Answer 1

Answer:

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

Explanation:

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).