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Practical Organic Chemistry question

2021 · 26 Feb · Shift 1 · Q2
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Practical Organic Chemistry question

2021 · 26 Feb · Shift 1 · Q2

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
Which of the following is 'a' FALSE statement ?
  1. A
    Carius method is used for the estimation of nitrogen in an organic compound.
  2. B
    Kjeldahl's method is used for the estimation of nitrogen in an organic compound.
  3. C
    Carius tube is used in the estimation of sulphur in an organic compound.
  4. D
    Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7Mg_2P_2O_7Mg2​P2​O7​ by adding magnesia mixture.
View written solutionFree

Correct answer: A

  1. We need to identify the false statement.

  2. Check each option:

    A: Carius method is used for the estimation of nitrogen in an organic compound.

    • This is false.
    • The Carius method is used for estimation of halogens, sulphur, and phosphorus in organic compounds.
    • Nitrogen is not estimated by Carius method.

    B: Kjeldahl's method is used for the estimation of nitrogen in an organic compound.

    • This is true.
    • Kjeldahl's method is the standard method for estimation of nitrogen in many organic compounds.

    C: Carius tube is used in the estimation of sulphur in an organic compound.

    • This is true.
    • In Carius method, the compound is heated in a Carius tube with fuming nitric acid, and sulphur is estimated after oxidation.

    D: Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7Mg_2P_2O_7Mg2​P2​O7​ by adding magnesia mixture.

    • This is true.
    • On oxidation, phosphorus gives phosphoric acid, which with magnesia mixture ultimately gives magnesium ammonium phosphate and on ignition forms Mg2P2O7Mg_2P_2O_7Mg2​P2​O7​.

  3. Therefore, the only false statement is:

A\boxed{A}A​

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