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Exceptions in Physical Properties

The particles...

Question

The particles of powder are given an electric charge while spraying them to form the powder coating. Give reasons.

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Solution

The particles of powder are given an electric charge while spraying them to form the powder coating so that a uniform layer of the powder sticks to the metal surface.

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Give scientific explanation

a. Bleaching powder has the odour of chlorine.

b. The hard water of a well becomes soft on adding washing soda to it.

c. Soap forms a precipitate in hard water.

d. The particles of powder are given an electric charge while spraying them to form the powder coating.

e. The aluminium article is used as an anode in the anodising process.

f. When the radiation coming out from certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.

g A certain type of ceramic tiles are fixed on the outer layer of a space shuttle.

Q. What are the advantages of powder coating?

Q. The iron articles coated with powder coating method are:

Question 8

Explain powder coating and anodizing?

Q. Powder coating is a process which requires a solvent to keep the binder and filler parts in a liquid suspension form.

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Exceptions in Physical Properties

Standard VIII Chemistry

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