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  4. Identify the correct order of acidic strength of CO2 CuO, CaO, H2O

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Q. Identify the correct order of acidic strength of $ CO_2 CuO, CaO, H_2O$

Classification of Elements and Periodicity in Properties

Solution:

Non-metallic oxides are acidic and metallic oxides are basic. An increase in metallic (i.e., electropositive) character increases the basic nature of the oxide and an increase in non-metallic (i.e., electronegative) character increases the acidic nature of the oxide. Hence, the correct order is $CaO < \,CuO < \,H_2O < \,CO_2.$