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Thermodynamics question

2020 · Q87
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Thermodynamics question

2020 · Q87

NEETChemistryThermodynamicsMCQ+4 / −1
For the reaction, 2Cl(g) →\to→ Cl2(g), the correct option is :
  1. A
    ΔrH>0{\Delta _r}H \gt 0Δr​H>0 and ΔrS<0{\Delta _r}S \lt 0Δr​S<0
  2. B
    ΔrH<0{\Delta _r}H \lt 0Δr​H<0 and ΔrS>0{\Delta _r}S \gt 0Δr​S>0
  3. C
    ΔrH<0{\Delta _r}H \lt 0Δr​H<0 and ΔrS<0{\Delta _r}S \lt 0Δr​S<0
  4. D
    ΔrH>0{\Delta _r}H \gt 0Δr​H>0 and ΔrS>0{\Delta _r}S \gt 0Δr​S>0
View written solutionFree

Correct answer: C

Given reaction,
2Cl(g)→\to→Cl2(g)
This is an endothermic reaction because it requires energy to break bonds.
So, the reverse reaction is exothermic
ΔrH<0{\Delta _r}H \lt 0Δr​H<0
Also, two gaseous atoms combine together to form 1 gaseous molecule.
So, the randomness,
ΔrS<0{\Delta _r}S \lt 0Δr​S<0

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