Question

Astha has been collecting coins of two
metals X and Y. One day she observed a
black coating on the coins of metal Y and
some brown spot on coins of metal X.
The chemical compositions of the
substance formed on the surface of
metal X and Y are​

Answer 1

Answer:

X- Copper(II) Oxide(CuO)

Y- Iron(III) Oxide(Fe2O3)

Explanation:

X is made up of copper because copper on exposure to moisture and oxygen it turns to black spot of copper oxide whereas is Y coin is made up of iron because we know that when iron is exposed to oxygen or it when it comes in contact to moisture it forms a brown coating of iron (II)oxide ,Thus the answer is justified .