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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 4 April 2025, Shift 2, Chemistry Q52

Question 52 of 75 in this shift, Chemistry question 2 of 25, Section A.

Consider the given data : (a) HCl(g)+10 H2O(l)→HCl.10 H2O\mathrm{HCl(g)+10\ H_2O(l)\rightarrow HCl.10\ H_2O} ΔH=−69.01\Delta H=-69.01 kJ mol−1^{-1} (b) HCl(g)+40 H2O(l)→HCl.40 H2O\mathrm{HCl(g)+40\ H_2O(l)\rightarrow HCl.40\ H_2O} ΔH=−72.79\Delta H=-72.79 kJ mol−1^{-1} Choose the correct statement :
  1. (1)The heat of solution depends on the amount of solvent.Official answer
  2. (2)The heat of dilution for the HCl (HCl.10 H2O\mathrm{HCl.10\ H_2O} to HCl.40 H2O\mathrm{HCl.40\ H_2O}) is 3.78 kJ mol−1^{-1}.
  3. (3)Dissolution of gas in water is an endothermic process.
  4. (4)The heat of formation of HCl solution is represented by both (a) and (b).

Official answer

Option 1

NTA final key.

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

Same topic in other shifts

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  5. 3 Apr 2025, Shift 1 · Q71Given : ΔHsub⊖\Delta H^{\ominus}_{sub} [C (graphite)] = 710 kJ mol−1^{-1} ΔC−HH⊖\Delta_{C-H}H^{\ominus} = 414 kJ mol−1^{-1}…MediumNumerical value
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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 42 of the 174 JEE Main shifts held from 2017 to 2026.