Which of the following sets has the strongest tendency to form anions?

The oxide of a metal $(R)$ can be reduced by the metal $(P)$,and metal $(R)$ can reduce the oxide of metal $(Q)$. Then the decreasing order of the reactivity of metals $(P)$,$(Q)$,and $(R)$ with oxygen is:

Among $Al_2O_3$,$SiO_2$,$P_2O_3$,and $SO_2$,the correct order of acidic strength is:

Which of the following elements forms an acidic oxide?

The correct order of decreasing acidic nature of oxides is:

Identify the statements which are not correct?
$(i)$ $ZnO, PbO, Sb_2O_3$ are neutral oxides.
(ii) $CO$ and $NO$ are amphoteric oxides.
(iii) $CrO_3, Mn_2O_7, V_2O_5$ are basic oxides.