Which element among the following does $NOT$ form diatomic molecules?

Which of the following gas is/are called rare gas?

The element that can even diffuse through silica glass is

What is the correct order of solubility of $He, Ne, Ar, Kr,$ and $Xe$ in water?

Xenon hexafluoride on partial hydrolysis produces compounds $X$ and $Y$. Compounds $X$ and $Y$ and the oxidation state of $Xe$ are respectively

What is the atomic state of noble gases?