Write the balanced chemical equations for the following reactions<br><b>(a) </b>Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogencarbonate.<br><b>(b) </b>Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.<br><b>(c)</b> Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu<sub>2 </sub>I<sub>2</sub> ), liberates iodine gas and also forms potassium sulphate.