Which of the following is 'a' FALSE statement ?
Show Hint
- Carius method is used for the estimation of nitrogen in an organic compound.
- Kjeldahl's method is used for the estimation of nitrogen in an organic compound.
- Carius tube is used in the estimation of sulphur in an organic compound.
- Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as \(\mathrm{Mg_2P_2O_7}\) by adding magnesia mixture.
The Correct Option is A
Solution and Explanation
(1) Nitrogen is estimated by Dumas method or Kjeldahl's method. The Carius method is used for halogens, sulphur and phosphorus. So statement (1) is FALSE.
(2) Kjeldahl's method estimates nitrogen (in compounds other than nitro, azo and ring nitrogen compounds). TRUE.
(3) Sulphur is oxidised to H2SO4 in a Carius tube with fuming HNO3 and weighed as BaSO4. TRUE.
(4) Phosphorus is oxidised to H3PO4, precipitated as MgNH4PO4 with magnesia mixture and ignited to Mg2P2O7. TRUE.
Answer: (1) Carius method is used for the estimation of nitrogen in an organic compound.
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