In the manufacture of which of the following acids or chemicals is the Contact Process involved?

Options :
  1. Nitric acid
  2. Sulfuric acid
  3. Ammonia
  4. Caustic soda

Answer and Explanation :-

Answer: Option 2


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We join spokes together in a wheel, but it is the center hole that makes the wagon move.We shape clay into a pot, but it is the emptiness insidethat holds whatever we want.We hammer wood for a house, but it is the inner spacethat makes it livable.We work with being, but non-being is what we use.
-Lao Tzu