Question

A hard metal A which is normally use in construction industry when exposed to air developed a reddish layer B. Identify A and B. Name the change.​

Answer 1

Answer:

Explanation:

It is clear that A is copper developing green layer of CuCO 3

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(B).

Cu forms 2 types of oxides: Cu 2O

and CuOCu 2O is red while CuO is black.

Hence, A= Cu, B= CuCO

3

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, C= CuO, D= C² O .