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Control and Coordination
(a) Acids are sour in taste and change the colour of blue litmus to red, Acid contain H+ ion in solution.
(b) They are produced when oxides of non-metals react with water.
Common acids are: (i) HCl—Hydrochloric acid, (ii) H2SO4—Sulphuric acid, (iii) HNO3— Nitric acid etc.
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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?
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