In contact process, to which substance adequate quantities of water is added to convert it to sulphuric acid?
Correct answer: A. H2S2O7
- A. H2S2O7
- B. HSO4-
- C. SO3
- D. S
Explanation
In the contact process, SO₃ is not added directly to water because it forms a mist that is hard to absorb. Instead, SO₃ is first absorbed in concentrated H₂SO₄ to form oleum (H₂S₂O₇). Adding adequate water to oleum safely produces sulphuric acid (H₂SO₄).
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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