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Control And Coordination

Question
CBSEENSC10010926
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Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?

Solution
 Tooth enamel is made of calcium phosphate, a3(PO4)2 . It does not dissolve in water, but is corrode when the pH in the mouth is below 5.5. Sugar present in chocolates and sweets gets broken by bacteria present in the mouth to acids. This lowers the pH in the mouth. To prevent tooth enamel from decay, toothpaste is used because it is alkaline and neutralises the acid produced in the mouth and helps to prevent lowering of pH in the mouth.

Some More Questions From Control and Coordination Chapter

What do you understand by concentrated and dilute acids?

How do metals react with bases?

What is a neutralization reaction? Give some examples.

What are non-metallic oxides? Substantiate your answer.

Take 5 ml hydrochloric acid in a boiling tube or a conical flask. Add a few pieces of zinc granules to it.

(a) What do you observe on the surface of zinc granules?
(b) Name the gas evolved.
(c) What happens when the above gas is passed through soap solution?
(d) What happens when a burning candle is brought near the gas filled tube?

Name four acids and bases. Write their formulae.

Name the various kind of oxides and mention their properties.

What are acids? How are they produced?

Mention important characteristics of acids.

Why the vessels of copper and brass need ‘Kalai’?

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