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UPPSC PCS 2025 · Question 46 of 150

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

Polity

  1. AOnly 1
  2. BNeither 1 nor 2
  3. COnly 2
  4. DBoth 1 and 2Correct

Answer: D. Both 1 and 2

Explanation

When silver articles are exposed to air for a long time, they react with sulphur compounds present in the atmosphere (especially hydrogen sulphide, H₂S). This reaction forms a black coating of silver sulphide (Ag₂S) on the surface of silver items.

Source: selfstudywala.com UPPCS Prelims 2025 GS Paper 1 detailed solution (based on UPPCS official answer key)

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