Chlorine was discovered by

Which one of the following pairs of substances when mixed,produces chlorine gas at room temperature?

Consider the oxy acids $HClO_{n}$ series,where the value of $n$ is $1$ to $4$. Then,the incorrect statement regarding these oxy acids is:

What are the products formed when moist chlorine gas is reacted with hypo?

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

The chief source of iodine in which it is present as sodium iodate is