Sulphuric Acid Preparation

How is dilute sulphuric acid prepared?

How is sulphuric acid prepared by contact process? Write its reaction with H_2 S and KBr .

Marble stone is not treated with diluted sulphuric acid to prepare carbon dioxide. Why?

You are provided with 90 mL of distilled water and 10 mL of concentrated sulphuric acid to prepare dilute sulphuric acid. What is the correct way of preparing dilute sulphuric acid? Give reason.

How sulphuric acid is prepared industrially by Contact process ? Support your answer by writing fully balanced chemical equations.

Name a solid which can be used instead of concentrated sulphuric acid to prepare ethylene by the dehydration of ethanol.