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Highly selective Backlog Qs for JEE MainChemistryThermodynamics (C)

For which of the following reactions, ∆ H is equal to ∆ U ?

Options

  1. AN 2 g + 3 H 2 g → 2 NH 3 g
  2. B2 HI g → H 2 g + I 2 g
  3. C2 SO 2 g + O 2 g → 2 SO 3 g
  4. D2 NO 2 g → N 2 O 4 g

Correct answer

B. 2 HI g → H 2 g + I 2 g

Step-by-step solution

∆ H = ∆ U + ∆ n g RT 2 HI ( g ) → H 2 ( g ) + I 2 ( g ) ∆ n g = 1 + 1 - 2 = 0 so, ∆ H = ∆ U .

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