Given below are two statements:
Statement I: Chlorine can easily combine with oxygen to from 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.

Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode.

This is TRUE. Chlorine forms several oxides such as $$Cl_2O$$, $$ClO_2$$, $$Cl_2O_6$$, and $$Cl_2O_7$$. These chlorine oxides are highly unstable and have a strong tendency to explode. They are powerful oxidizing agents.

Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.

This is TRUE. The chemical reactivity of elements is commonly assessed by studying their reactions with oxygen (to form oxides) and halogens (to form halides). These reactions help determine the oxidation states, bond energies, and overall reactivity patterns of elements.

Therefore, both Statement I and Statement II are true.