All the elements in a group in the periodic table have the same

The acidic,basic and amphoteric oxides,respectively,are

Which of the following represents the correct order of acidic strength of the given oxides?

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

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:

Which group of the periodic table contains only metals?