JEE Main 2015ChemistryGeneral Organic ChemistryMediumMCQ

JEE Main 2015 — General Organic Chemistry Question with Solution

JEE Main 2015 (10 Apr Online)

Question

1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10 H2SO4 solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is:

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Show full solutionCorrect option: D
Correct answer
D10

Step-by-step explanation

Total millimoles of sulphuric acid =60×110=6 mm H2SO4

Excess H2SO4≡20×110×12=1 mm H2SO4

H2SO4 used in reaction with ammonia =6-1=5 mm

Based on the reaction stoichiometry, 2NH3+H2SO4⟶NH42SO4

mm of NH3=10 mm

Mass of N=10×10-3×14gmole=0.140g

% N2=0.1401.4×100=10%

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About this question

This is a previous-year question from JEE Main 2015, covering the General Organic Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.