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Dear student,

Most oxides of non metals are acidic in nature  because they give acid 
 After recating with H2O as ;
​​​​CO2 + H2O = H2CO3

most of the oxides of metals are basic in nature as they form base upon reaction with water as;
K2O + H2O = KOH 
Amphoteric oxides are the oxides which react with acid as well as bases  to give salt and water and are insoluble in water as ;
 Hence carbondioxide  is acidic, potassiumoxide is basic and aluminium oxide is amphoteric in nature.



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Option C is correct
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