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Control And Coordination

Question
CBSEENSC10010983
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What happens when:
(a) Quick lime is added to water?
(b) Carbon dioxide gas is passed through slaked lime?
(c) Chlorine gas is passed through dry slaked lime?

Solution
(a) Slaked lime is formed when quick lime reacts with water and form Calcium Hydroxide.


CaO(s) + H2O(l) →               Ca(OH)2                     Quick                           Calciumlime                            hydroxide

(b) Upon passing carbon dioxide gas through slaked lime, calcium carbonate is formed,

Ca(OH)2 + CO2(g) → CaCO3(s) + H2O(l)

(c) When chlorine is passed through slaked lime, bleaching powder is formed.
Ca(OH)2(s) + Cl2(g) → CaOCl2(s) + H2O(l)

Some More Questions From Control and Coordination Chapter

What are olfactory indicators?

You are given the following solutions:

Hydrochloric acid (HCl), sulphuric acid (H2SO4), nitric acid (HNO3), acetic acid (CH3COOH), sodium hydroxide (NaOH), calcium hydroxide [(Ca(OH)2], potassium hydroxide (KOH), magnesium hydroxide [Mg(OH)2] and ammonium hydroxide (NH4OH). Give the colour change for each of these solutions with red litmus, blue litmus, phenolphthalein and methyl orange solutions.

Choose the olfactory indicators and give their characteristics: red cabbage extract, onion, vanilla extract, litmus, clove oil.

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.

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