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JEE Main20257 Apr 2025Evening ShiftChemistryThermodynamics (C)Actual

The correct statement amongst the following is :

Options

  1. AThe term 'standard state' implies that the temperature is 0^ C
  2. BThe standard state of pure gas is the pure gas at a pressure of 1 bar and temperature 273 K
  3. C_ f H ₂₉₈^ is zero for O ( g )
  4. D_ f H ₅₀₀^ is zero for O ₂( ~g )

Correct answer

D. _ f H ₅₀₀^ is zero for O ₂( ~g )

Step-by-step solution

For standard state pressure =1 bar and temperature is specified only ( H _ f ^ o )_ O _ 2,( ~g ) =0

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