Which pair of elements has the same chemical properties?

The electronic configuration of three elements $A, B$ and $C$ are given below. The molecular formula of the compound formed from $B$ and $C$ will be
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

The correct order of relative basic character of $NaOH$,$Mg(OH)_2$ and $Al(OH)_3$ is

Arrange the following in the order of increasing basic character: $(NO_2, K_2O, ZnO)$

What is an amphoteric oxide?

Which of the following is the correct order of gradually decreasing basic nature of the oxides?