A silver object get a black coating over time when they are exposed to air. This is due to traces of which one of the following in air?
چاندی کے شے کو وقت کے ساتھ ساتھ سیاہ کوٹنگ ملتی ہے جب وہ ہوا کے سامنے آتے ہیں۔ اس کی وجہ یہ ہے کہ ہوا میں مندرجہ ذیل میں سے کس کے نشانات ہیں؟
Answer: Hydrogen sulphide
Explanation
Silver reacts with hydrogen sulphide (H₂S) in the air to form black silver sulphide (Ag₂S) coating.
This process is called tarnishing.
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