AIPMT PRELIMS2009Chemistry-Thermodynamics
AIPMT PRELIMS 2009 Chemistry Gibbs Free Energy MCQ Question
Type: MCQ-numerical-Medium-Class 11
The values of ΔH and ΔS for the reaction, C(graphite) + CO₂(g) → 2CO(g) are 170 kJ and 170 JK⁻¹, respectively. This reaction will be spontaneous at
A
910 K
B
1110 K
C
510 K
D
710 K
Correct Answer
Option B
Detailed Explanation
For spontaneity, ΔG must be negative. Using the equation ΔG = ΔH - TΔS, we find that T must be greater than 1000 K for ΔG to be negative.
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