The set of amphoteric oxides among $ZnO$,$Tl_2O_3$,$In_2O_3$,$B_2O_3$,$PbO$,$SnO_2$ is

In the periodic table,with an increase in atomic number,how does the metallic character of an element change?

Beryllium shows diagonal relationship with

Red hot carbon will remove oxygen from the oxides $XO$ and $YO$ but not from $ZO$. $Y$ will remove oxygen from $XO$. Use this evidence to deduce the order of activity of the three metals $X, Y$ and $Z$ putting the most active first.

$Fe x_2$ and $Fe y_3$ are known when $x$ and $y$ are :

Identify the amphoteric and neutral oxide pair among the following.