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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 26 July 2022, Shift 2, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

Class XII students were asked to prepare one litre of buffer solution of pH 8.26 by their Chemistry teacher. The amount of ammonium chloride to be dissolved by the student in 0.2 M ammonia solution to make one litre of the buffer is (Given: pKb\mathrm{pK_b} (NH3\mathrm{NH_3}) = 4.74 Molar mass of NH3\mathrm{NH_3} = 17 g mol−1\mathrm{mol^{-1}} Molar mass of NH4Cl\mathrm{NH_4Cl} = 53.5 g mol−1\mathrm{mol^{-1}})
  1. (1)53.5 g
  2. (2)72.3 g
  3. (3)107.0 gOfficial answer
  4. (4)126.0 g

Official answer

Option 3

NTA final key.

Chapter
Equilibrium
Topic
pH and Buffers
Idea tested
Basic Buffer pH Calculation

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2026, Shift 1 · Q74The pH of a solution obtained by mixing 55 mL of 0.10.1 M NH4OH\mathrm{NH_4OH} solution with 250250 mL of 0.10.1 M NH4Cl\mathrm{NH_4Cl} solution…MediumNumerical value
  2. 26 Aug 2021, Shift 1 · Q55The OH−\mathrm{OH^-} concentration in a mixture of 5.0 mL of 0.0504 M NH4Cl\mathrm{NH_4Cl} and 2 mL of 0.0210 M NH3\mathrm{NH_3} solution is…MediumNumerical value

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.