HCOOH reacts with conc. H₂SO₄ to produce

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CO₂

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answer is A.

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Detailed Solution

When formic acid (HCOOH) reacts with concentrated sulfuric acid (H₂SO₄), the following reaction occurs:

HCOOH + H₂SO₄ → HCOHSO₄ + H₂O

The product formed is formyl hydrogen sulfate (HCOHSO₄) and water (H₂O). This is an example of an acid-catalyzed esterification reaction, where the sulfuric acid acts as a catalyst to promote the reaction between formic acid and itself, resulting in the formation of the ester, HCOHSO₄.

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