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Physical and Chemical Changes

Corrosion of ...

Question

Corrosion of silver is a chemical change ?

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Solution

Yes it is a chemical change.
Silver reacts with hydrogen sulphide in the atmosphere and readily forms a surface tarnish of silver sulfide.

2Ag + H2S→Ag2S + H2

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Q. Corrosion of metals is an example of a chemical change

The rusting of an iron object is called:

(a) corrosion and it is a physical as well as a chemical change

(b) dissolution and it is a physical change

(c) corrosion and it is a chemical change

(d) dissolution and it is a chemical change

Q. Question 2
Rusting of an article made up of iron is called

(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

Which one of the following is not a chemical change?

(a) Formation of curd (b) Ripening of banana

(c) Sublimation of naphthalene (d) Corrosion of photo frame

Q. Corrosion is a chemical reaction that involves :

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