What is the actual order of acidicity of following compounds ? CO_(2)

1.	What is the actual order of acidicity of following compounds ? CO_(2) , CuO, CaO, H_(2) O
Answer» `CAO lt CUO lt H_(2)O lt CO_(2)` `CuO lt CaO lt H_(2)O lt CO_(2)` `H_(2)O lt CO_(2) lt CuO lt CuO ` `CaO lt H_(2)O lt CuO lt CO_(2)` ANSWER :b

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