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NEET2020ChemistryThermodynamics (C)Actual

For the reaction, 2 Cl g → Cl 2 g , the correct option is

Options

  1. AΔ r H > 0 and Δ r S < 0
  2. BΔ r H < 0 and Δ r S > 0
  3. CΔ r H < 0 and Δ r S < 0
  4. DΔ r H > 0 and Δ r S > 0

Correct answer

C. Δ r H < 0 and Δ r S < 0

Step-by-step solution

2 Cl ( g ) ⟶ Cl 2 ( g ) In this reaction number of gaseous mole decreases hence entropy decreases, Δ r S < 0 Decomposition of Cl 2 into gaseous atoms is an endothermic process. Therefore, its reverse is an exothermic process, Δ r H < 0

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