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

Consider the following transformations:
$I. XeF_6 + NaF \to Na^+[XeF_7]^-$
$II. 2PCl_{5(s)} \to [PCl_4]^+[PCl_6]^-$
$III. [Al(H_2O)_6]^{3+} + H_2O \to [Al(H_2O)_5OH]^{2+} + H_3O^+$
Which of the above transformations are correct?

Liquid $X$ is used in a bubble chamber to detect neutral mesons and gamma photons. Then, $X$ is

Which elements were discovered by the scientists Ramsay and Glenn $T$. Seaborg?

What is the product formed when $XeF_4$ reacts violently with water?

Which one of the following statements regarding helium is incorrect?