Ozone is not .....

Why is a Tyndall box used in the manufacture of sulfuric acid by the contact process?

What is the abundance of sulfur in the Earth's crust?

$A$ pale yellow solid molecule $(A)$ having crown shape is heated with conc. $H_2SO_4$. It gives a suffocating smell of gas $(B)$,which when passed through starch iodate paper,turns it blue. The gas $(B)$ is:

What is the correct order of acidic nature for the given oxides?

Which of the following is used to absorb sulphur dioxide?