$Be$ and $Al$ resemble in:

Identify the correct order of acidic strengths of $CO_2, CuO, CaO, H_2O:-$

Given below are the oxides:
$Na_{2}O, As_{2}O_{3}, N_{2}O, NO$ and $Cl_{2}O_{7}$
Number of amphoteric oxides is ..... .

Given below are two statements :
Statement $I$ : An element in the extreme left of the periodic table forms acidic oxides.
Statement $II$ : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.
In the light of the above statements,choose the correct answer from the options given below :

The elements with the following atomic numbers belong to the same group:

Which among the following elements exhibits diagonal relationship with $Li$?