Question

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

• A. $2KClO_3 {->[\Delta]} 2KCl + 3O_2$
• B. $Cr_2O_3 + 2Al {->[\Delta]} Al_2O_3 + 2Cr$
• C. $Fe + 2HCl \to FeCl_2 + H_2 \uparrow$
• D. $2Pb(NO_3)_2 \to 2PbO + 4NO_2 + O_2 \uparrow$

Answer 1

Answer: (B)

$Cr_2O_3 + 2Al {->[\Delta]} Al_2O_3 + 2Cr$

Answer 2

More electropositive element displaces less
electropositive metal