Question

3) Assertion - %. of Cu in different oxides formed
by Cu is same.
Reason! - A chemical compound is always made up of
came elements Combined together in a fixed
proportion by mass,​

Answer 1

Answer:

assertion and reason both are incorrect

Explanation:

In CuO, there is 64g of Cu with 16g of O, so the ratio is 4:1, whereas in Cu2O, there is 128g of Cu with 16g of O, so the ratio is 8:1