2021 Redox ReactionsTypes of Redox Reactions – Displacement Reactions Easy Question 10 of 30 in Redox Reactions

Which of the following reactions is the metal displacement reaction? Choose the right option.

A $Cr_2O_3+2Al\xrightarrow{\Delta}Al_2O_3+2Cr$
B $Fe+2HCl\rightarrow FeCl_2+H_2\uparrow$
C $2Pb(NO_3)_2\rightarrow2PbO+4NO_2+O_2\uparrow$
D $2KClO_3\xrightarrow{\Delta}2KCl+3O_2$

The answer is A.

Solution

Aluminium is more electropositive than chromium, so it displaces chromium from $Cr_2O_3$: $Cr_2O_3 + 2Al \xrightarrow{\Delta} Al_2O_3 + 2Cr$ – metal displacement reaction.

Concept metal displacement reaction

Redox Reactions in past papers

30 questions from this chapter have appeared across 19 exam years.