Question

A shiny brown coloured element x on heating in air forms a substance y when hydrogen gas is passed over heated y it aga

Answer 1

Answer:

Element x is copper (Cu).

Substance y is CuO (COPPER OXIDE)

Explanation:

Answer 2

Answer:

The element ‘X’ is copper and the black coloured compound formed is copper oxide (CuO). The chemical equation corresponding to the given reaction is shown below.

2Cu+O2→2CuO

The above reaction involves the oxidation of copper due to the addition of oxygen.