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Copper and silver lie below hydrogen in ...

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

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Due ot high polarising power of Cu and Ag ions, their sulphides are even more stable than the metals.
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Copper and silver are below hydrogen in the electrochemical series and yet they are found in the combined state as sulphides. Comment.

Copper is found both in free as well as in combined state in nature.

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