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

(1) 2Pb(NO ) 2PbO 4NO O 3 2 2 2 2) 2KClO 2KCl 3O 3 2  (3)Cr O 2Al Al O 2Cr 2 3 2 3 (4) Fe 2HCl FeCl H     2 2

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Correct  option is 3) \(Cr_2O_3+2Al\rightarrow Al_2O_3+2Cr\)

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