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Question

When I2 dissociated to its form the following reaction occurs:
I2(g)2I(g);H0=+150kJ.
The reaction is favoured at ?

A
low temperature
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B
high temperature
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C
no change with temperature
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D
high pressure.
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Solution

The correct option is C high temperature
I2(g)2I(g);ΔHo=+150KJ
From Gibbs free energy change equation,
ΔG=ΔHTΔS
If ΔH>0 then ΔG<0 when T is high.
Since here the heat is consumed by the reaction, it is an endothermic reaction, i.e reactants require heat or energy to overcome the forces of attraction between molecules and to separate them from one another (the activation energy) than the energy gained when new bonds are formed. Thus high temperatures are required for this.
Hence, option B is correct.

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