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Control And Coordination

Question

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What is antichlor? Why do you use antichlor after treating the clothes with bleaching powder?

Solution

Antichlor is a substance used to remove excess of chlorine from a material/cloth. Examples are sodium bisulphite and sodium thiosulphate.

After the clothes are treated with bleaching powder and acid solutions, some chlorine remains sticking to the fibre which may injure it if not removed quickly after bleaching is over. Chlorine is removed by reaction with sodium bisulphite as given below:

NaHSO₃ + Cl + H₂O → NaHSO₄ + 2HCl

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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