The interhalogen which does not exist is

Who established the elemental nature of chlorine?

In the following reaction, products $x$ and $y$ respectively, are
$P_4 + 10 SO_2Cl_2 \longrightarrow x + y$

When chlorine gas is passed through an aqueous solution of a potassium halide in the presence of chloroform,a violet colouration is obtained. On passing more of chlorine water,the violet colour disappears and the solution becomes colourless. This test confirms the presence of ........... in the aqueous solution.

Explain the electron gain enthalpy values of elements of the $17^{\text{th}}$ group. Give reasons and explain.

Chlorine acts as a bleaching agent only in the presence of which of the following?