Question

Name the brown colour substance which on heating in air forms a substance x when h2 gas is passed over the x,it again changes to back into that brown colour substance​

Answer 1

Answer:The brown substance' X' is copper .When it is heated copper oxide is formed . The reaction is as follows.It is a combination reaction. 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.

Explanation:

Answer 2

Answer:

Explanation:

The brown colour substance is copper Cu which on heating oxidises to form CuO which is black in colour and by passing h2 it refuses to for Cu which is brown in colour