Which of the following metals will decompose most easily on heating ?
ZnO,CuO,MgO,Ag2O

Dear student,Heating the thermally unstable metal oxides like HgO and AgO2 which easily decompose into metal and oxygen on heating​. Ag2O=2Ag + O2 (g) The other three are normal oxides do not normally decompose on heating​. Hence option 4 is correct.Regards.