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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 10 April 2023, Shift 1, Chemistry Q62

Question 62 of 90 in this shift, Chemistry question 2 of 30, Section A.

Given (A) 2CO(g)+O2(g)→2CO2(g)2\mathrm{CO(g)} + \mathrm{O_2(g)} \rightarrow 2\mathrm{CO_2(g)} ΔH1θ=−x kJ mol−1\Delta \mathrm{H}_1^{\theta} = -x\ \mathrm{kJ\,mol^{-1}} (B) C(graphite)+O2(g)→CO2(g)\mathrm{C(graphite)} + \mathrm{O_2(g)} \rightarrow \mathrm{CO_2(g)} ΔH2θ=−y kJ mol−1\Delta \mathrm{H}_2^{\theta} = -y\ \mathrm{kJ\,mol^{-1}} The ΔHθ\Delta \mathrm{H}^{\theta} for the reaction C(graphite)+12O2(g)→CO(g)\mathrm{C(graphite)} + \frac{1}{2}\mathrm{O_2(g)} \rightarrow \mathrm{CO(g)} is
  1. (1)x+2y2\frac{x+2y}{2}
  2. (2)2y−x2y - x
  3. (3)2x−y2\frac{2x-y}{2}
  4. (4)x−2y2\frac{x-2y}{2}Official answer

Official answer

Option 4

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
Enthalpy and Hess's Law
Idea tested
Manipulating Thermochemical Equations

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. 8 Apr 2026, Shift 2 · Q74Consider 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…EasyNumerical value
  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
  6. 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

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.