A. Fe2O3 + 2Al → Al2O3 + 2Fe + heat B. Pb (NO3)2 + 2KI → PbI2(↓ )+ 2KNO3

Question

Identify the type of each of the following reactions stating the reason for your answers.

A. \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe + \text{heat }\)

B. \(Pb (NO_3)_2 + 2KI \rightarrow PbI_2(\downarrow)+ 2KNO_3\)

Answer 1

A. Exothermic/Displacement reaction/Redox reaction. Heat is evolved or a More reactive element displaces a less reactive element or aluminium reduces iron (II) oxide to iron 

B. Double displacement / Precipitation reaction. As there is an exchange of ions between reactants and products / (Yellow) precipitate (of Lead iodide) is formed