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प्रश्न
Give two tests to identify sulphuric acid.
लघु उत्तर
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उत्तर
Barium Chloride Test: Adding BaCl2 solution forms a thick white precipitate of Barium sulphate which is insoluble in any dilute mineral acid.
\[\ce{H2SO4 + BaCl2 -> BaSO4 ↓ (White ppt.) + 2HCl}\]
Action on Copper: Heating concentrated sulphuric acid with copper turnings evolves a pungent gas (sulphur dioxide) that turns acidified potassium dichromate paper green.
\[\ce{Cu + 2H2SO4 (conc.) ->[\Delta] CuSO4 + 2H2O + SO2 ^}\]
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