Silver metal becomes black on exposure to air by the coating ofa)Silver chlorideb)Silver oxidec)Silver sulphided)Silver hydroxideCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Silver sulphide

Silver articles when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide (black colour). The correct option is 'C' because silver react with hydrogen sulphide present in air and formed a black layer of silver sulphide.

Answer

Silver reacts with Hydrogen sulphide present in air to form silver sulphide and form hydrogen gas.

The above reaction is:-

Ag + H2S ----- Ag2S (black) + H2

Answer

Silver reacts with hydrogen sulphide present in air to for silver sulphide and form hydrogen gas. The above reaction is AG+H2S----AG2S (Black)+H2.That only the answer silver sulphide is correct.

Answer

Explanation:

When silver metal is exposed to air, it undergoes a chemical reaction with the oxygen in the air to form a layer of silver sulfide (Ag2S) on its surface. This reaction is known as tarnishing, and it is the reason why silver metal turns black when exposed to air.

Here is a detailed explanation of the reaction:

1. Oxidation of silver:
When silver metal is exposed to air, it reacts with the oxygen in the air to form silver oxide (Ag2O). This reaction can be represented by the following equation:

2Ag + O2 → 2Ag2O

2. Reaction with hydrogen sulfide:
The silver oxide formed on the surface of the silver metal reacts further with hydrogen sulfide (H2S) present in the air to form silver sulfide (Ag2S). This reaction can be represented by the following equation:

Ag2O + H2S → Ag2S + H2O

3. Formation of black coating:
The silver sulfide formed in the reaction with hydrogen sulfide is black in color. It forms a thin layer on the surface of the silver metal, giving it a black appearance.

4. Protection against further tarnishing:
Once the silver metal is coated with a layer of silver sulfide, it becomes less reactive and is protected against further tarnishing. This is because the layer of silver sulfide acts as a barrier, preventing oxygen and other reactive substances from coming into contact with the underlying silver metal.

Therefore, the correct answer is option 'C' - Silver sulfide (Ag2S) is responsible for the black coating on silver metal when it is exposed to air.

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