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Control And Coordination

Question
CBSEENSC10010936
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The tanks in which milk is stored for retail selling are cleaned with sodium hydroxide solution everytime fresh milk is filled in them. Give the reason for this practice.

Solution
Milk contains lactic acid and its effect remains in the empty tank. The acidic effect in the tank can be neutralized by cleaning it with a solution of a base, e.g., NaOH. It changes the acid into salt which then gets removed from the tank by cleaning with water.

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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