Which of the following reactions is the metal displacement reaction ? Choose the right option. (A) 2KClO3 D ¾¾® 2KCl + 3O2 (B) Cr2O3 + 2Al D ¾¾® Al2O3 + 2Cr (C) Fe + 2HCl ® FeCl2 + H2 (D) 2Pb(NO3)2 ®

Question

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

(A) 2KClO3 D ¾¾® 2KCl + 3O2
(B) Cr2O3 + 2Al D ¾¾® Al2O3 + 2Cr
(C) Fe + 2HCl ® FeCl2 + H2­
(D) 2Pb(NO3)2 ® 2PbO + 4NO2 + O2­

Prashant Kotian · Accepted Answer

Correct answer: B. Aluminium is more electropositive than Cr, so it displaced chromium from Cr2O3. Cr2O3 + Al D ¾¾® Al2O3 + Cr

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