Question

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 1

Answer:

Sulphides

Explanation:

This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide (black colour)

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Answer 2

This is due to the formation of a layer of its sulphide.

Explanation:

• When silver reacts in the air with hydrogen sulphide gas, it forms silver sulphide, which is a thick black layer.
• Due to the formation of silver sulphide on their surfaces, silver ornaments or jewellery become dull.  
• It is to be noted that sulfide is a sulfur that is inorganic anion having the chemical formula, S²⁻.
• It is a compound having more or one S²⁻ ions. Sulfide salt solutions are corrosive. It also refers to the organic and inorganic compounds’ large families. For example, dimethyl sulfide and lead sulfide.