Copper and silver lie low in the electrochemical series

cbse
isolationofelements

#1

Copper and silver lie low in the electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.


#2

At higher temperature, the reaction between copper and sulphur becomes feasible. So, they combine together and copper exists as copper sulphides in nature. Besides this, due to high polarising power of copper and silver ions, their sulphides are more stable.