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. (i) Give two industrial applications …

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. (i) Give two industrial applications of distillation under reduced pressure. (ii) Why is it necessary to use acetic acid and not hydrochloric acid for acidification of sodium extract for testing sulphur by lead acetate test?

    • Posted by Slr Teja 8 years, 10 months ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Naveen Sharma 8 years, 10 months ago

    Ans. (i)Distillation Under Reduced Pressure is used for purifying or separating thermally unstable liquid compounds.

    Uses :

    • In Petroleum Refining
    • in food processing

    (ii) For testing of sulphur present in the organic compound, the Lassaigne’s extract is acidified with acetic acid (CH3COOH) and not sulphuric acid because lead acetate is soluble and does not interfere with the test. If sulphuric acid (H2SO4 ) is used, lead acetate will react with H2SO4 itself to form white ppt. PbSO4.

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