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NTA Abhyas NEET2020ChemistryChemical EquilibriumPractice

For which process will Δ H ° and Δ G ° are expected to be most similar?

Options

  1. A2 A l ( s ) + F e 2 O 3 ( s ) → 2 F e ( s ) + A l 2 O 3 ( s )
  2. B2 N a ( s ) + 2 H 2 O ( l ) → 2 N a O H ( a q . ) + H 2 ( g )
  3. C2 N O 2 ( g ) → N 2 O 4 ( g )
  4. D2 H 2 ( g ) + O 2 ( g ) → 2 H 2 O ( g )

Correct answer

A. 2 A l ( s ) + F e 2 O 3 ( s ) → 2 F e ( s ) + A l 2 O 3 ( s )

Step-by-step solution

2 A l ( s ) + F e 2 O 3 ( s ) → 2 F e ( s ) + A l 2 O 3 ( s ) As in this reaction all reactants and products are in solid states so in this reaction Δ S ° ≈ 0 hence Δ G ° ≈ Δ H ° . Δ G = Δ H - T Δ S ≈ Δ H - 0 ≈ Δ H

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