With reference to 'Silver articles', which of the following statements is/are correct?
1. Silver articles turn black after some time when exposed to air.
2. It happens due to coating of silver sulphide.
Select the correct answer from the code given below:

Correct answer: (b) Both 1 and 2

Explanation

Silver articles turn black on exposure to air over time, a process called tarnishing (Statement 1 correct).

Trace sulphur compounds, especially hydrogen sulphide (H₂S), react with silver to form a black coating of silver sulphide (Ag₂S) (Statement 2 correct).

Moisture in the air accelerates this surface reaction.