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JEE Advanced 2010Paper 1
Exam
JEE Advanced
Year
2010
Paper
Paper 1
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Advanced 2010 · Paper 1 · Chemistry · Thermodynamics (C)

The species which by definition has zero standard molar enthalpy of...

The species which by definition has zero standard molar enthalpy of formation at 298 K298 \mathrm{~K} is

Options

  1. ABr2(g)\mathrm{Br}_2(g)
  2. BCl2(g)\mathrm{Cl}_2(g)
  3. CH2O(g)\mathrm{H}_2 \mathrm{O}(g)
  4. DCH4(g)\mathrm{CH}_4(g)

Correct answer

B. Cl2(g)\mathrm{Cl}_2(g)

Step-by-step solution

ΔHf∘\Delta H_f^{\circ}\left(\mathrm{Cl}_2, g\right)=0 \Delta H_f^{\circ} of elements in their standard state is taken to be zero. Cl2\mathrm{Cl}_2 is gas, Br2\mathrm{Br}_2 is liquid and I2\mathrm{I}_2 is solid at room temperature. Energetics Conceptual, implication of rules/laws III
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