Which of the following is $Not$ predominantly acidic or amphoteric oxide?

Given below are two statements:
Statement $I$ : Both metal and non-metal exist in $p$ and $d-$block elements.
Statement $II$ : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.
In the light of the above statements,choose the most appropriate answer from the option given below:

On moving from left to right across a period in the periodic table,the metallic character:

Which of the following oxides is most basic?

Which one of the following reactions does not occur?

Which one of the following represents the electronic configuration of the most electropositive element?