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Question

Identify the correct order of acidic strength of CO2, CuO, CaO, and H2O:


A

CaO < CuO < H2O < CO2

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B

H2O < CuO < CaO < CO2

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C

CaO < H2O < CuO < CO2

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D

H2O < CO2 < CaO < CuO

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Solution

The correct option is A

CaO < CuO < H2O < CO2


Clearly, water is neutral. CuO is mildly basic whereas CaO is much more basic than Copper (II) oxide.

CO2 is acidic. Hence, CaO < CuO < H2O < CO2


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