1.

The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its: (a) oxide (b) hydride (c) sulphide (d) carbonate

Answer»

The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide (b) hydride (c) sulphide (d) carbonate



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