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JEE Advanced2010ChemistryThermodynamics (C)Actual

The species which by definition has zero standard molar enthalpy of formation at 298 ~K is

Options

  1. ABr ₂(g)
  2. BCl ₂(g)
  3. CH ₂ O (g)
  4. DCH ₄(g)

Correct answer

B. Cl ₂(g)

Step-by-step solution

H_f^ ( Cl ₂, g )=0 H_f^ of elements in their standard state is taken to be zero. Cl ₂ is gas, Br ₂ is liquid and I ₂ is solid at room temperature. Energetics Conceptual, implication of rules/laws III

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