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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctHardConceptual

JEE Main 6 April 2026, Shift 2, Chemistry Q56

Question 56 of 75 in this shift, Chemistry question 6 of 25, Section A.

Given is a concentrated solution of a weak electrolyte AxBy\mathrm{A_xB_y} of concentration 'c' and dissociation constant 'K'. The degree of dissociation is given by :
  1. (1)[K×cx+y−1xxyy]x+y\left[\mathrm{K}\times c^{x+y-1}x^{x}y^{y}\right]^{x+y}
  2. (2)(Kcx+y−1xxyy)1x+y\left(\frac{\mathrm{K}}{c^{x+y-1}x^{x}y^{y}}\right)^{\frac{1}{x+y}}Official answer
  3. (3)(cx+y−1xxyyK)x+y\left(\frac{c^{x+y-1}x^{x}y^{y}}{\mathrm{K}}\right)^{x+y}
  4. (4)(cx+y−1xxyyK)1x+y\left(\frac{c^{x+y-1}x^{x}y^{y}}{\mathrm{K}}\right)^{\frac{1}{x+y}}

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 4× in all
  1. 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
  2. 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
  3. 5 Sep 2020, Shift 1 · Q48A 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…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.