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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 5 April 2024, Shift 1, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always −57-57 kJ mol−1^{-1} Reason (R) : Enthalpy of neutralisation is the amount of heat liberated when one mole of H+\mathrm{H^+} ions furnished by acid combine with one mole of −OH\mathrm{^-OH} ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below.
  1. (1)Both (A) and (R) are true and (R) is the correct explanation of (A)Official answer
  2. (2)Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. (3)(A) is true but (R) is false
  4. (4)(A) is false but (R) is true

Official answer

Option 1

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
Enthalpy and Hess's Law
Idea tested
Constant Enthalpy of Neutralization

Same idea in other shifts

Asked 3× in all
  1. 29 Jul 2022, Shift 1 · Q84When 600 mL of 0.2 M HNO3\mathrm{HNO_3} is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is…MediumNumerical value
  2. 27 Aug 2021, Shift 1 · Q52200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is −57.1-57.1 kJ. The increase in…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.