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Thermodynamics

  • Enthalpy Changes and Reaction Energy Profiles
  • Hess's Law and Thermochemical Calculations
  • Entropy Change in Physical and Chemical Processes
  • Work Done in Reversible Isothermal Expansion of Ideal Gas
  • Isothermal, Isochoric, Isobaric and Adiabatic Processes
  • Enthalpy Change and Internal Energy Change
  • Work Done in Isothermal and Adiabatic Processes
  • Heat Capacity – Relation between Cp and Cv
  • Second Law – Entropy of Irreversible Processes
  • Enthalpy and Entropy Changes
  • Thermodynamic Processes – Free Expansion
  • Work Done in Expansion against Constant Pressure
  • Entropy and Spontaneity
  • First law of thermodynamics
  • Gibbs free energy and spontaneity ($\Delta H$ from $\Delta U$ for gaseous reactions)
  • Free expansion of an ideal gas into vacuum
  • Sign conventions for endothermic and exothermic reactions
  • Bond enthalpy values
  • Relation between enthalpy change and internal energy change
  • Bond enthalpy calculations
  • Gibbs free energy and spontaneity
  • Enthalpy change for decomposition (reverse) reaction
All Exams › NEET Previous Year Questions › Chemistry › Thermodynamics › Sign conventions for endothermic and exothermic reactions

Sign conventions for endothermic and exothermic reactions

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2024 Re-NEET 1 question

  1. For an endothermic reaction: (A) $q_p$ is negative. (B) $\Delta_rH$ is positive. (C) $\Delta_rH$ is negative. (D) $q_p$ is positive. Choose the correct answer from the options given below:
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