Write the molecular formula of Marshall's acid.

Among the elements of group $16$,which element exists in a metallic lattice in its monoatomic state and also exhibits two crystalline forms,$\alpha$ and $\beta$?

Which of the following compounds of sulphur does not hydrolyze at room temperature?

Among the hydrides formed by the group $16$ elements,only $H_2O$ has an abnormally low volatility (high boiling point). This is so because

Assertion : Both rhombic and monoclinic sulphur exist as $S_8$ but oxygen exists as $O_2$.
Reason : Oxygen forms $p\pi-p\pi$ multiple bond due to small size and small bond length but $p\pi-p\pi$ bonding is not possible in sulphur.

Which of the following statements regarding sulphur is not correct?