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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 3 September 2020, Shift 1, Chemistry Q30

Question 30 of 75 in this shift, Chemistry question 5 of 25.

An acidic buffer is obtained on mixing :
  1. (1)100 mL of 0.1 M HCl and 200 mL of 0.1 M NaCl
  2. (2)100 mL of 0.1 M HCl and 200 mL of 0.1 M CH3COONa\mathrm{CH_3COONa}Official answer
  3. (3)100 mL of 0.1 M CH3COOH\mathrm{CH_3COOH} and 200 mL of 0.1 M NaOH
  4. (4)100 mL of 0.1 M CH3COOH\mathrm{CH_3COOH} and 100 mL of 0.1 M NaOH

Official answer

Option 2

NTA final key (Sep 2020).

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

Same idea in other shifts

Asked 2× in all
  1. 3 Aug 2021, Shift 2 · Q55The 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…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.