Fluorine is prepared by

Which of the following statements is correct?

Which of the following oxyacids of chlorine does not contain a lone pair of electrons on the chlorine atom?

An aqueous solution of a halogen salt of potassium reacts with the same halogen $X_2$ to give $KX_3$,a brown-coloured solution,in which the halogen exists as the $X_3^-$ ion,$X_2$ acts as a Lewis acid,and $X^-$ acts as a Lewis base. The halogen $X$ is:

Which of the following halides is inert towards hydrolysis at room temperature?

Artificial smoke screens are made by