Q.

The contact process is involved in the manufacture of -

A. Nitric acid
B. Sulphuric acid
C. Ammonia
D. Caustic soda
Answer» B. Sulphuric acid
Explanation: It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
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