Physical and chemical changes — practice question

A set of symbol equations and word equations, labelled A to J, is given below. A Fe$^{3+}$ + 3OH$^-$ $\rightarrow$ Fe(OH)$__3$ B H$^+$ + OH$^-$ $\rightarrow$ H$__2$O C ethane + chlorine $\rightarrow$ chloroethane + hydrogen chloride D C$__{12}$H$__{26}$ $\rightarrow$ C$__8$H$__{18}$ + C$__4$H$__8$ E ethene + steam $\rightarrow$ ethanol F chlorine + aqueous potassium iodide $\rightarrow$ iodine + aqueous potassium chloride G C$__6$H$__{12}$O$__6$ $\rightarrow$ 2C$__2$H$__5$OH + 2CO$__2$ H ethanoic acid + ethanol $\rightarrow$ ethyl ethanoate + water I calcium carbonate $\rightarrow$ calcium oxide + carbon dioxide J 6CO$__2$ + 6H$__2$O $\rightarrow$ C$__6$H$__{12}$O$__6$ + 6O$__2$ Use these equations to respond to the questions below. An equation may be chosen once, more than once, or not used at all. Write the letter, A to J, for the equation that shows: