A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
The phenomenon due to which silver articles turn black is called ___.

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Solution

Metals such as silver when attacked by substances around it such as moisture, acids, gases etc, are said to corrode and this phenomenon is called corrosion. The black substance is formed because silver (Ag) reacts with $H_{2} S$ present in air. It forms thin black coating of silver sulphide $(A g_{2} S)$ .

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A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. Name the black substance formed and give its chemical formula :

Question 38

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.

(a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.

(b) Name the black substance formed and give its chemical formula.

Silver articles turn black when exposed to the atmosphere for a few days due to the formation of silver sulphide.

Q. Silver articles turn black when exposed to the atmosphere for a few days.

Q. Why do silver articles turn black when kept open for a few days?
(a) Name the phenomenon involved.
(b) Name the black substance formed and give its chemical formula.

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A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. The phenomenon due to which silver articles turn black is called ___.

Metals such as silver when attacked by substances around it such as moisture, acids, gases etc, are said to corrode and this phenomenon is called corrosion. The black substance is formed because silver (Ag) reacts with H2S present in air. It forms thin black coating of silver sulphide (Ag2S).

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
The phenomenon due to which silver articles turn black is called ___.