JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 7 April 2025, Shift 2, Chemistry Q52

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

The correct statement amongst the following is :

(1)The term 'standard state' implies that the temperature is $0^\circ$ C.
(2)The standard state of a pure gas is the pure gas at a pressure of 1 bar and temperature 273 K.
(3) $\Delta_fH^{\theta}_{298}$ is zero for O(g)
(4) $\Delta_fH^{\theta}_{500}$ is zero for $\mathrm{O_2}$ (g)Official answer

Official answer

Option 4

NTA final key.

Chapter: Thermodynamics (Chemistry)
Topic: Enthalpy and Hess's Law
Idea tested: Standard Reference States of Elements

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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.