Write chemical reactions in the manufacture of sulfuric acid by contact process

The catalyst used in the manufacture of sulphuric acid by contact process is :

Mention the favourable conditions for the manufacture of sulphuric acid by contact process.

Which of the following statements is correct of the manufacture of sulphuric acid by contact process?

The manufacture of sulphuric acid by the contact process involves the catalyst

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphours pentachloride.