State condition and reaction for synthesis of `SO_3` from `SO_2` in contact process. What is Oleum?

Write condition and balanced chemical equation for synthesis of SO_3 from SO_2 in contact process. How H_2SO_4 is prepared from SO_3 ?

Write down the conditions and reaction of preparation of H_2SO_4 by contact process.

Write balanced chemical equation with conditions for the industrial manufacture of SO_3 from SO_2 by the contact process. How is H_2SO_4 prepared from the SO_2 produced?

Write down the conditions and reaction of preparation of HNO_3 by Ostwald's process.

State the conditions of SN^2 reaction? What is I-effect?

Describe manufacture of H_(2)SO_(4) by contact process.

Write the conditions to maximise the yield of H_(2)SO_(4) by Contact process.

Give the key reaction involved in the manufacture of sulphuric acid by contact process.

What are spontaneous reactions? What are the conditions for the spontaneity of a process?

What is sink? Name one sink of SO_2