Excess of $PCl_{5}$ reacts with conc $H_{2}SO_{4}$ to give:

In the following, the oxoacid with a peroxy bond is

Which of the following statements regarding sulphur is not correct?

When a small amount of $KMnO_4$ is added to concentrated $H_2SO_4$,a green oily compound is obtained which is highly explosive in nature. The compound is:

Which of the statements given below is incorrect?

Although fluorine is more electronegative than oxygen,the ability of oxygen to stabilize higher oxidation states exceeds that of fluorine. Why?