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Control and Coordination
Question
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Mention important characteristics of acids.

Answer

Characteristics of acids:
(i) They are sour in taste.

(ii) They turn blue litmus to red.

(iii) Acids react with metals to evolve hydrogen gas.
2HCl + Mg → MgCl2 + H2 ↑
H2SO4 + Zn → ZnSO4 + H2 ↑
2HCl + 2Na → 2NaCl + H2 ↑

(iv) Acids react with bases to form salt and water. This is called neutralisation.
HCl + NaOH → NaCl + H2O
H2SO4 + Ca(OH)2 → CaSO4 + 2H2O

(v) Acids react with basic oxides to form salt and water.
CaO + 2HCl → CaCl2 + H2O
Na2O + H2SO4 → Na2SO4 + H2O

(vi) Acids react with carbonates to form salt, water and carbon dioxide.
CaCO3 + 2HCl → CaCl2 + H2O + CO2 ↑
MgCO3 + H2SO4 → MgSO4 + H2O + CO2 ↑

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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?