Verified Solution • 2025–26 Session moderate

QJEEM07Cha2fd: JEE Main 2007 Chemistry - Class 11 JEEM07Cha2fd Solution: In conversion of lime-stone to lime, CaCO 3 (s) → CaO(s) + CO 2 …

In conversion of lime-stone to lime,
CaCO3(s) → CaO(s) + CO2 (g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ∆H° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is :

Multiple Choice Options

  • A 1008 K
  • B 1200
  • C 845 K
  • D 1118 K

Step-by-Step Verified Solution

ΔG∘=ΔH∘−TΔS∘

For a spontaneous reaction ΔG∘<0

or ΔH∘−TΔS∘<0

⇒T>ΔH∘ΔS∘

⇒T>179.3×103160.2>1117.9K≈1118K

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