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When conc. H 2 SO 4 is added to cane sugar then charring of sugar takes place: C 12 H 22 O 11 ( s ) + H 2 SO 4 ( aq ) + 1/2 O 2 ( g ) → 11C( s ) + CO 2 ( g ) + 12H 2 O( g ) + SO 2 ( g )

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451. Why is sulphuric acid a good dehydrating agent?

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452. What happens when conc. H₂SO₄ is slowly added to cane sugar?

When conc. H₂SO₄ is added to cane sugar then charring of sugar takes place:

C₁₂H₂₂O₁₁(s) + H₂SO₄(aq) + 1/2 O₂(g) → 11C(s) + CO₂(g) + 12H₂O(g) + SO₂(g)