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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 3 August 2021, Shift 2, Chemistry Q55

Question 55 of 90 in this shift, Chemistry question 25 of 30, Section B.

The pH of the solution resulted when 150 mL of 0.1 M ammonia solution is titrated with 50 mL of 0.1M HCl [pKb(NH3)\mathrm{pK_b(NH_3)} = 4.7] is ‾\underline{\hspace{2em}}. (Nearest integer) [log⁡102=0.30\log_{10} 2 = 0.30]

Official answer

10

NTA final key.

Chapter
Equilibrium
Topic
pH and Buffers
Idea tested
Buffer Formation via Partial Neutralization

Same idea in other shifts

Asked 2× in all
  1. 3 Sep 2020, Shift 1 · Q30An acidic buffer is obtained on mixing :MediumSingle correct

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.