Consider the reaction equilibrium:
On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is
lowering of temperature as well as pressure
increasing temperature as well as pressure
lowering the temperature and increasing the pressure
any value of temperature and pressure.
As we learnt in
Effect of Pressure change -
A pressure change obtained by changing the volume can affect the yield of product in case of a gaseous reaction where the total number of moles of gaseous reactant and total number of moles of gaseous product are different.
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Effect of temperature change -
When a change in temperature occur, the value of equilibrium constant Kc is changed.
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The conversion of SO2 to SO3 is an exothermic reaction, hence decrease the temperature will favour the forward reaction. There is also a decrease in volume or moles in product side. Thus the reaction is favoured by low temperature and high pressure. (LeChatelier's principle).
Option 1)
lowering of temperature as well as pressure
Option 2)
increasing temperature as well as pressure
Option 3)
lowering the temperature and increasing the pressure
Option 4)
any value of temperature and pressure.
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