Which of the following elements shows polymorphism?

Write the molecular formula of Marshall's acid.

Write a preparation of dioxygen. Explain the physical and chemical properties of dioxygen. State uses of dioxygen.

Observe the following reactions:
$P_4 + 8SOCl_2 \longrightarrow 4PCl_3 + 4SO_2 + 2S_2Cl_2$
$P_4 + 10SO_2Cl_2 \longrightarrow 4PCl_5 + 10SO_2$
In both the reactions,a common product '$x$' is obtained. The number of lone pair of electrons on the central atom of '$x$' is:

Ozone,when reacts with potassium iodide solution,liberates a certain product which turns starch paper blue. The liberated substance is......

Determine whether the following statements are True $(T)$ or False $(F)$:
$1.$ $SO_2$ is converted to $SO_3$ in the production of sulfuric acid.
$2.$ Ziegler catalyst is used for the oxidation of $SO_2$ to $SO_3$.