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Formic acid is obtained when

1. Calcium acetate is heated with conc. H2SO4
2. Calcium formate is heated with calcium acetate
3. Glycerol is heated with oxalic acid at 373 K
4. Acetaldehyde is oxidised with K2Cr2O7 and H2SO4

Correct answer: Glycerol is heated with oxalic acid at 373 K

Solution

Formic acid is produced when glycerol is heated with oxalic acid at 373 K due to the decomposition of oxalic acid, which releases formic acid as a product.

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