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NEET 2009
Exam
NEET
Year
2009
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2009 · Chemistry · Chemical Kinetics

The values of Δ H and Δ S for the reaction, C (graphite) +CO_2(~g)...

The values of ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} for the reaction, C\mathrm{C} (graphite) +CO2( g)→2CO(g)+\mathrm{CO}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}(\mathrm{g}) are 170 kJ170 \mathrm{~kJ} and 170JK−1170 \mathrm{JK}^{-1} respectively. This reaction will be spontaneous at -

Options

  1. A510 K510 \mathrm{~K}
  2. B710 K710 \mathrm{~K}
  3. C910 K910 \mathrm{~K}
  4. D1110 K1110 \mathrm{~K}

Correct answer

D. 1110 K1110 \mathrm{~K}

Step-by-step solution

For a spontaneous reaction ΔG=−ve\Delta \mathrm{G}=-\mathrm{ve}Or ar eq. ΔG=0\Delta \mathrm{G}=0ΔH=TΔST=ΔHΔS=170×103170=1000 K\begin{aligned}\Delta \mathrm{H}& =\mathrm{T} \Delta \mathrm{S}\\ \mathrm{T}& =\frac{\Delta \mathrm{H}}{\Delta \mathrm{S}}\\ & =\frac{170 \times 10^3}{170}\\ & =1000 \mathrm{~K} \end{aligned}$$
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