Acidic strength has been compared before here and here, but the first question is about organic chemistry (and I am talking about inorganic chemistry), and the second does not discuss molecules such as $\ce{Cl2O7}$, $\ce{P4O10}$, $\ce{CO2}$, $\ce{N2O5}$, $\ce{Al2O3}$ etc. These molecules do not contain hydrogen. So what are the factors which affect their acid or base strength?
The following question brings me this doubt:
Which of the following is the correct order of acidic strength?
(A) $\ce{Cl2O7}$ > $\ce{SO2}$ > $\ce{P4O10}$
(B) $\ce{CO2}$ > $\ce{N2O5}$ > $\ce{SO3}$
(C) $\ce{Na2O}$ > $\ce{MgO}$ > $\ce{Al2O3}$
(D) $\ce{K2O}$ > $\ce{CaO}$ > $\ce{MgO}$