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Question

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Give your remark on: “Commercial bleaching powder is sold on the basis of its available chlorine.”

Solution

With dilute acids, bleaching powder gives up whole of its chlorine,
CaOCl₂ + H₂SO₄ → CaSO₄ + H₂O + Cl₂The chlorine so formed is called available-chlorine and a good sample of bleaching powder contains 35—40% chlorine. The value of bleaching powder in the market is proportional to the quantity of available chlorine. Greater the amount of chlorine liberated higher is its price.

Some More Questions From Control and Coordination Chapter

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’?

How can you test the presence of an acid in any substance?

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