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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 25 July 2022, Shift 2, Chemistry Q63

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

Ka1\mathrm{K_{a_1}}, Ka2\mathrm{K_{a_2}} and Ka3\mathrm{K_{a_3}} are the respective ionization constants for the following reactions (a), (b), and (c). (a) H2C2O4=H++HC2O4−\mathrm{H_2C_2O_4 = H^+ + HC_2O_4^-} (b) HC2O4−=H++C2O42−\mathrm{HC_2O_4^- = H^+ + C_2O_4^{2-}} (c) H2C2O4=2H++C2O42−\mathrm{H_2C_2O_4 = 2H^+ + C_2O_4^{2-}} The relationship between Ka1\mathrm{K_{a_1}}, Ka2\mathrm{K_{a_2}} and Ka3\mathrm{K_{a_3}} is given as
  1. (1)Ka3=Ka1+Ka2\mathrm{K_{a_3} = K_{a_1} + K_{a_2}}
  2. (2)Ka3=Ka1−Ka2\mathrm{K_{a_3} = K_{a_1} - K_{a_2}}
  3. (3)Ka3=Ka1/Ka2\mathrm{K_{a_3} = K_{a_1} / K_{a_2}}
  4. (4)Ka3=Ka1×Ka2\mathrm{K_{a_3} = K_{a_1} \times K_{a_2}}Official answer

Official answer

Option 4

NTA final key.

Chapter
Equilibrium
Topic
Chemical Equilibrium
Idea tested
Equilibrium Constant for Modified Equations

Same idea in other shifts

Asked 9× in all
  1. 4 Apr 2026, Shift 1 · Q55At T(K), the equilibrium constant of A2(g)+B2(g)⇌C(g)\mathrm{A_2}(g)+\mathrm{B_2}(g)\rightleftharpoons \mathrm{C}(g) is 2.7×10−52.7\times10^{-5}. What is the…EasySingle correct
  2. 8 Apr 2026, Shift 2 · Q55Consider the following reactions in which all the reactants and products are present in gaseous state 2 xy⇌x2+y22\,xy \rightleftharpoons x_2 + y_2…MediumSingle correct
  3. 4 Apr 2024, Shift 2 · Q63The equilibrium constant for the reaction SO3(g)⇌SO2(g)+12O2(g)\mathrm{SO_3(g) \rightleftharpoons SO_2(g) + \frac{1}{2}O_2(g)} is…EasySingle correct
  4. 8 Apr 2024, Shift 1 · Q63For the given hypothetical reactions, the equilibrium constants are as follows : X⇌Y\mathrm{X\rightleftharpoons Y}; K1=1.0K_1=1.0…EasySingle correct
  5. 26 Jul 2022, Shift 1 · Q86At 298 K, the equilibrium constant is 2×10152 \times 10^{15} for the reaction :…MediumNumerical value
  6. 30 Jun 2022, Shift 1 · Q64The equilibrium constant for the reversible reaction 2A(g)⇌2B(g)+C(g)2\mathrm{A(g)} \rightleftharpoons 2\mathrm{B(g)}+\mathrm{C(g)} is K1\mathrm{K_1}…EasySingle correct
  7. 4 Sep 2020, Shift 2 · Q28If the equilibrium constant for A⇌B+C\mathrm{A \rightleftharpoons B + C} is Keq(1)K_{eq}^{(1)} and that of B+C⇌P\mathrm{B + C \rightleftharpoons P}…EasySingle correct
  8. 6 Sep 2020, Shift 2 · Q44The value of Kc\mathrm{K_c} is 64 at 800 K for the reaction N2(g)+3H2(g)⇌2NH3(g)\mathrm{N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)} The value of…EasySingle 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.