Sulphurous acid (H2SO3) is a dibasic acid, i.e., it contains two replaceable hydrogen ions per molecule of the acid. Hence, it can form normal salt as well as acid salt on reaction with an alkali.
Question
Give reasons for the following: Sulphurous acid forms two types of salts on reaction with an alkali.
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The diagram represents the preparation of sodium sulphate salt from dil. H2SO4 acid and sodium hydroxide. 
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Give balanced equations for the preparation of the following salts: 1. Calcium oxide ⟶ Calcium chloride ⟶ Calcium carbonate 2. Zinc sulphide ⟵ Zn ⟶ Zinc sulphate 3. Iron [II] chloride ⟵ Fe ⟶ Iron [III] chloride 4. Lead [II] oxide ⟶ Lead nitrate ⟶ Lead sulphate 5. Copper [II] oxide ⟶ Copper [II] sulphate ⟵ Copper [II] hydroxide
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