Question

When copper is heated in a flame, it loses its characteristic reddish-brown colour. This is due to a) The formation of a black coloured layer of copper (II) oxide. b) The formation of a green coloured layer of cuprous oxide. c) The formation of a red coloured layer of copper (I) oxide. d) The formation of a brown-black coloured layer of cupric oxide.

Answer 1

Answer:

Option d) The formation of a brown - black k coloured layer of cupric oxide.

Explanation:

When copper is heated in a flame then it reacts with oxygen and cupric oxide is formed. Copper is a metal that can form many oxides.

When copper is placed in a flame with oxygen the flame changes its colour to bright green.

Chemical reaction for the change that occurs :

Copper + Oxygen -----> Copper (II) oxide.

2Cu + O2 -----> 2CuO