Which of the following represents the correct order of acidic strength?

Choose the correct order of acidic strength for $CO_2, CuO, CaO, H_2O$.

The first member of each group of representative elements (i.e.,$s$- and $p$-block elements) shows anomalous behaviour. Illustrate with two examples.

The acidic,basic and amphoteric oxides,respectively,are

Explain the trends in chemical reactivity and properties across the periodic table.

Given below are two statements:
Statement $I$: Chlorine can easily combine with oxygen to form oxides,and the product has a tendency to explode.
Statement $II$: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.
In the light of the above statements,choose the correct answer from the options given below.