Q. 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) $2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2\uparrow$
D) $2KClO_3 \xrightarrow{\Delta} 2KCl + 3O_2$
Explanation
[Solution] Al displaces Cr from $Cr_2O_3$ (aluminothermy), a metal displacement reaction. (b) displaces hydrogen; (c) and (d) are decompositions. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.