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Friday, 9 October

JEE Main 2026 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 8 April 2026, Shift 2, Chemistry Q74

Question 74 of 75 in this shift, Chemistry question 24 of 25, Section B.

Consider the reaction 2H2S(g)+3O2(g)→2H2O(l)+2SO2(g)2\mathrm{H_2S(g)} + 3\mathrm{O_2(g)} \rightarrow 2\mathrm{H_2O(l)} + 2\mathrm{SO_2(g)} The magnitude of enthalpy change for the reaction in kJ mol−1^{-1} is ________. (Nearest integer) Given : ΔfH⊖(H2S)=−20.1\Delta_f H^{\ominus}(\mathrm{H_2S}) = -20.1 kJ mol−1^{-1} ΔfH⊖(H2O)=−286.0\Delta_f H^{\ominus}(\mathrm{H_2O}) = -286.0 kJ mol−1^{-1} ΔfH⊖(SO2)=−297.0\Delta_f H^{\ominus}(\mathrm{SO_2}) = -297.0 kJ mol−1^{-1}

Official answer

1126

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
Enthalpy and Hess's Law
Idea tested
Formation and Combustion

Same topic in other shifts

All Enthalpy and Hess's Law questions
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  2. 4 Apr 2026, Shift 1 · Q54Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity…EasyTwo statements
  3. 4 Apr 2026, Shift 2 · Q71If 3.365 g of ethanol (ll) is burnt completely in a bomb calorimeter at 298.15 K, the heat produced is 99.472 kJ. The…HardNumerical value
  4. 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
  5. 3 Apr 2025, Shift 2 · Q53Given below are two statements: Statement I : When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed…EasyTwo statements
  6. 3 Apr 2025, Shift 2 · Q72A sample of n-octane (1.14 g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ…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 42 of the 174 JEE Main shifts held from 2017 to 2026.