Question

# In the van 't Hoff Equation d ln KdT=ΔH∘RT2 Which are the following statements is true?

A
The slope of the graph when lnK is plotted vs 1T increases and then decreases
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B
The slope of the graph when lnK is plotted vs 1T is positive throughout
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C
When d ln KdT<0, the reaction is endothermic
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D
When d ln KdT<0, the reaction is exothermic
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Solution

## The correct option is D When d ln KdT<0, the reaction is exothermicIn van 't Hoff's Equation d ln KdT=ΔH∘RT2 or, ln K=−ΔH∘R1T+C This is a linear equation so the slope is constant throughout. The slope of the graph would depend on the sign of ΔH and it can be negative or positive if the reaction is endothermic or exothermic respectively.

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