Question

A metal 'A' when heated in air turn brown to black in colour agins turn to brown when heated in the presence of hydrogen gas .Answer the following

a)Name the metal A
b) what is the name and the formula of the compound when heated in air
c) what type of reaction is it ?
d)write chemical reaction and balance it ? ​

Answer 1

Answer:

1. the metal A is copper.
2. the compound formed by heating in air is copper oxide (cuo).
3. it is a type of combustion reaction.
4. 2cu + o2 — 2cuo.

when it is passed through hydrogen gas it is reduced again to copper so it becomes brown in colour

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