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Saturday, 31 October

JEE Main 2020 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 5 September 2020, Shift 1, Chemistry Q48

Question 48 of 75 in this shift, Chemistry question 23 of 25.

A soft drink was bottled with a partial pressure of CO2\mathrm{CO_2} of 3 bar over the liquid at room temperature. The partial pressure of CO2\mathrm{CO_2} over the solution approaches a value of 30 bar when 44 g of CO2\mathrm{CO_2} is dissolved in 1 kg of water at room temperature. The approximate pH of the soft drink is __________×10−1\times 10^{-1}. (First dissociation constant of H2CO3=4.0×10−7\mathrm{H_2CO_3} = 4.0\times10^{-7} ; log⁡2=0.3\log 2 = 0.3; density of the soft drink =1 g mL−1= 1\ \mathrm{g\ mL^{-1}})

Official answer

37.00

NTA final key (Sep 2020).

Chapter
Solutions
Topic
pH and Buffers
Idea tested
pH of Weak Acids and Bases

Same idea in other shifts

Asked 4× in all
  1. 6 Apr 2026, Shift 2 · Q56Given is a concentrated solution of a weak electrolyte AxBy\mathrm{A_xB_y} of concentration 'c' and dissociation constant 'K'. The degree of…HardSingle correct
  2. 28 Jul 2022, Shift 1 · Q85KaK_a for butyric acid (C3H7COOH\mathrm{C_3H_7COOH}) is 2×10−52\times10^{-5}. The pH of 0.2 M solution of butyric acid is __________…EasyNumerical value
  3. 3 Aug 2021, Shift 1 · Q55If 1 M solution of acetic acid is diluted xx times so that pH of the solution is doubled. The value of of xx is (Ka\mathrm{K_a} =…HardNumerical 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.