Which of the following statements is not correct?

Given below are two statements: Statement $I$: The covalency of oxygen is generally two but it can exceed up to four. The oxidation state of oxygen in $SO_2$ is $-2$ and in $OF_2$ it is $+2$. Statement $II$: The anomalous behaviour of oxygen when compared to the other elements of group $16$ is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below.

The colour of liquid $O_2$ is

Which of the following compounds has reducing character?

Which of the following statements is false about oxygen and sulphur?

Caro's acid is