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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 26 February 2021, Shift 1, Chemistry Q41

Question 41 of 90 in this shift, Chemistry question 11 of 30, Section A.

Which of the following is ‘a’ FALSE statement ?
  1. (1)Carius tube is used in the estimation of sulphur in an organic compound.
  2. (2)Carius method is used for the estimation of nitrogen in an organic compound.Official answer
  3. (3)Kjeldahl’s method is used for the estimation of nitrogen in an organic compound.
  4. (4)Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7\mathrm{Mg_2P_2O_7} by adding magnesia mixture.

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.