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NEET2003ChemistryThermodynamics (C)Actual

For which one of the following equations is H _ react ^ equal to H _f^ for the product?

Options

  1. AN _ 2(g) + O _ 3(g) N ₂ O ₃(g)
  2. BCH _ 4(g) +2 Cl _ 2( ~g ) CH ₂ Cl _ 2(l) +2 HCl _ (g)
  3. CXe _ (g) +2 ~F _ 2(g) XeF _ 4(g)
  4. D2 CO _ (g) + O _ 2(g) 2 CO _ 2(g)

Correct answer

C. Xe _ (g) +2 ~F _ 2(g) XeF _ 4(g)

Step-by-step solution

Enthalpies of formation of elementary substances Xe and ( F ₂ ) are taken as zero. For (c) ( H_ reaction ^ ) (= H_f^ ( XeF ₄ )- [ H_f^ ( Xe )+2 H_f^ ( F ₂ ) ] ) Thus, ( H ^ ) reaction (= H ^ _ f ( XeF ₄ ) )

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