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NEET 2020
Exam
NEET
Year
2020
Subject
Chemistry
Chapter
Thermodynamics (C)

NEET 2020 · Chemistry · Thermodynamics (C)

For the reaction, 2Cl(g) → Cl _ 2 (g) , the correct option is

For the reaction, 2Cl(g)→Cl2(g)2Cl\left(g\right) \to {Cl}_{2}\left(g\right), the correct option is

Options

  1. AΔrH>0{\Delta}_{r}H > 0 and ΔrS<0{\Delta}_{r}S < 0
  2. BΔrH<0{\Delta}_{r}H < 0 and ΔrS>0{\Delta}_{r}S > 0
  3. CΔrH<0{\Delta}_{r}H < 0 and ΔrS<0{\Delta}_{r}S < 0
  4. DΔrH>0{\Delta}_{r}H > 0 and ΔrS>0{\Delta}_{r}S > 0

Correct answer

C. ΔrH<0{\Delta}_{r}H < 0 and ΔrS<0{\Delta}_{r}S < 0

Step-by-step solution

2Cl(g)⟶Cl2(g)2Cl ( g ) ⟶ {Cl}_{2} ( g )

In this reaction number of gaseous mole decreases hence entropy decreases, ΔrS<0{\Delta}_{r}S < 0

Decomposition of Cl2{Cl}_{2} into gaseous atoms is an endothermic process. Therefore, its reverse is an exothermic process, ΔrH<0{\Delta}_{r}H < 0

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