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20/09/2021 9:12 pm
Topic starter
Which of the following reactions is the metal displacement reaction?
Choose the right option.
(1) 2KClO3 + \(\overset{\Delta}\longrightarrow\) 2KCl + 3O2
(2) Cr2O3 + 2Al \(\overset{\Delta}\longrightarrow\) Al2O3 + 2Cr
(3) Fe + 2HCl → FeCl2 + H2↑
(4) 2Pb(NO3)2 → 2PbO + 4NO2 + O2↑
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1 Answer
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20/09/2021 9:14 pm
Correct answer: (2) Cr2O3 + 2Al \(\overset{\Delta}\longrightarrow\) Al2O3 + 2Cr
Explanation:
Aluminium is more electropositive than Cr, so it displaced chromium from Cr2O3.
Cr2O3 + 2Al \(\overset{\Delta}\longrightarrow\) Al2O3 + 2Cr