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Which of the following reactions is the ...

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

A

`Fe+2HClrarr FeCl_2+H_2uarr`

B

`2Pb(NO_3)_2 to 2PbO+4NO_2+O_2uarr`

C

`2KClO_3 overset(/_\)rarr 2KCl +3O_2`

D

`Cr_2O_3 +2Al overset(/_\)rarr Al_2O_3 +2Cr`

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