arrange the following oxides in order of increasing molecular (acidic) character so3, cl2O7, CaO and PbO2 ​  

Dear Student,

Oxides of metal are basic in nature whereas of non-metals are acidic. Therefore, acidity increases as metallic character decreases. 
Ca is metal whereas S, Cl and P are non metal. Therefore, CaO will be least acidic. Now, amongst the other three, Cl is the most non metallic element. Therefore, the order of increasing acidity will be 
CaO < PbO2 < SO3 < Cl​2O7

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