Question

Question of class 10.
Silver articles generally turns black when kept in open for few days.
The article when rubbed with toothpaste becomes shining .
1. Why do articles turn black when kept in open.
2. Name the black substance formed

Answer 1

The silver articles turn black when exposed to air as silver reacts with sulphur and forms a black layer of silver sulphide.......

Answer 2

1. articles turn black because iron reacts with moisture.
2. Rust.
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