Write a balanced chemical equation for each of the following reactions and also classify them.<br><b>(a) </b>Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.<br><b>(b)</b> A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.<br><b>(c)</b> Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.<br><b>(d) </b>Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.