Chemegate
Home/Practice Tests/PYQ Archive/Thermodynamics

GATE 2026 Chemical Engineering, Q27 · Thermodynamics

The correct answers are A. For endothermic reaction, it is positive.; B. For exothermic reaction, it is negative.; D. It is the enthalpy change for a process in which stoichiometric quantities of reactants, at a temperature and pressure, react completely in a single reaction to form products at the same temperature and pressure..

Question

Which of the following statements regarding the heat of reaction is/are CORRECT?

  • A. For endothermic reaction, it is positive.
  • B. For exothermic reaction, it is negative.
  • C. For exothermic reaction, it is positive.
  • D. It is the enthalpy change for a process in which stoichiometric quantities of reactants, at a temperature and pressure, react completely in a single reaction to form products at the same temperature and pressure.

Official answer: A. For endothermic reaction, it is positive.; B. For exothermic reaction, it is negative.; D. It is the enthalpy change for a process in which stoichiometric quantities of reactants, at a temperature and pressure, react completely in a single reaction to form products at the same temperature and pressure.

Why

GATE 2026 official key: (A, B, D). By convention ΔHrxn>0\Delta H_{rxn} > 0 for endothermic (A) and < 0 for exothermic (B, making C false); (D) is the standard definition of heat of reaction.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

Thermodynamics Topic Guide →More Thermodynamics PYQs →Take the Full GATE 2026 Test →