Which one of the following combinations represents a metallic element?

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 :

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

The element with $ns^2np^2$ valence shell configuration belongs to which group?

Identify the most acidic oxide among the following oxides based on their reaction.

In known elements,the maximum number is of