MCQ
Which of the following reactions is the metal displacement reaction? Choose the right option.
  • A
    $2 \mathrm{KClO}_{3} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_{2}$
  • $\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \stackrel{\Delta}{\longrightarrow} \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}$
  • C
    $\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_{2}+\mathrm{H}_{2} \uparrow$
  • D
    $2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2} \uparrow$

Answer

Correct option: B.
$\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \stackrel{\Delta}{\longrightarrow} \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}$
b
$\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \stackrel{\Delta}{\longrightarrow} \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}$

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