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Question

The preparation of SO3 (g) by reaction SO2(g)+12O2SO3(g) is an exothermic reaction. If the preparation follows the shown temperature-pressure relationship for its % yield at temperatures T1,T2 and T3, then the correct relation between T1,T2 and T3 is:
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A
T3>T2>T1
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B
T1>T2>T3
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C
T1=T2=T1
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D
T1>T3>T2
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Solution

The correct option is C T1>T2>T3
The equilibrium reaction SO2(g)+12O2SO3(g) is an exothermic reaction. When temperature is lowered, the forward reaction is favoured. This increases the yield of SO3. As seen from the graph, this will be possible when T1>T2>T3.

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